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Branden, arXiv:1410.6601: sum_k f(k) x^k / k! = f(theta) e^x = C e^x x^m prod (1 + x/a_j), a_j > 0); f(k) has one sign for k >= 0, so coefficients of one sign stay of one sign; applied to f(n, .) for each n","lean_route":null,"lean_declarations":["RealRooted.isMultiplierSequence_eval_of_roots_nonpos","RealRooted.isPFMultiplierSequence_eval_of_roots_nonpos","RealRooted.isMultiplierSequence_iff_preserves"],"certificate_hash":"d5147c061acd548054d11d7028e3488888bac3a51f9bb32b8266a5e11e6bd6d7","verification_polytool":"replayed","verification_lean":"not_attempted","claims":[{"claim":"real_rooted","from_index":1,"region":{"upper":{"closed":true,"value":"0"}}},{"claim":"interlacing","from_index":2,"kind":"weak","orientation":"unordered"}],"premises":[{"position":0,"node_id":"n-be3f02dc425ece52","role":"sequence","name":"basis_map_A007318 of Triangle of polynomial coefficients related to the series expansions of (1-x)^((-1-2*n)/2).","uses":{"claim":"real_rooted","from_index":1,"region":{"upper":{"closed":true,"value":"0"}}},"uses_text":"Every row P_n, n >= 1, is zero or real-rooted with all roots in (-inf, 0]"}]}],"used_by":[],"used_by_total":0,"links":[],"oeis":[],"bfiles":[],"oeis_texts":[{"oeis_id":"","target":"node","first_row":1,"oeis_offset":1,"reversed":false,"trim_zeros":"none","regular_triangle":false,"rows_shown":10,"polytool_commit":"c48629374597092cc41ef4d6273f37991516f984","triangle_example":"Triangle begins:\n   1:         1;\n   2:         3,          8;\n   3:        15,         64,          36;\n   4:       105,        568,         540,         128;\n   5:       945,       5952,        7416,        3072,        400;\n   6:     10395,      73032,      108360,       60160,      14000,       1152;\n   7:    135135,    1032576,     1737324,     1167360,     370000,      55296,      3136;\n   8:   2027025,   16569720,    30706452,    23687552,    9198000,    1895040,    197568,     8192;\n   9:  34459425,  297901440,   596573424,   511866880,  230389600,   58705920,   8517376,   655360,   20736;\n  10: 654729075, 5935802760, 12675451536, 11846620672, 5976986400, 1778934528, 321640704, 34701312, 2052864, 51200;\n","recurrence_sentence":"The row polynomials satisfy P(n,x) = -(4*n^2-12*n+9+(16*n-24)*x-36*x^2)*P(n-2,x) + ((16*n-24)*x^2+16*x^3)*d/dx P(n-2,x) + (4*n-4+8*x)*P(n-1,x) - 8*x^2*d/dx P(n-1,x) for n >= 3, with P(1,x) = 1, P(2,x) = 3 + 8*x.","mathematica":"P[1, x_] := 1;\nP[2, x_] := 3 + 8*x;\nP[n_, x_] := P[n, x] = Expand[-(4*n^2 - 12*n + 9 + (16*n - 24)*x - 36*x^2)*P[n - 2, x] + ((16*n - 24)*x^2 + 16*x^3)*D[P[n - 2, x], x] + (4*n - 4 + 8*x)*P[n - 1, x] - 8*x^2*D[P[n - 1, x], x]];\nTable[CoefficientList[P[n, x], x], {n, 1, 10}] // Flatten","pari":"P(N) = {my(v = vector(N)); v[1] = 1; v[2] = 3 + 8*x; for(n = 3, N, my(i = n); v[i] = -(4*n^2 - 12*n + 9 + (16*n - 24)*x - 36*x^2)*v[i - 2] + ((16*n - 24)*x^2 + 16*x^3)*deriv(v[i - 2], x) + (4*n - 4 + 8*x)*v[i - 1] - 8*x^2*deriv(v[i - 1], x)); v};\nrow(n, p) = {my(c = Vecrev(p)); c};\nT(N) = {my(v = P(N)); concat(vector(#v, i, row(i, v[i])))};\nT(10)","reading":{"first_row":1,"offset":1,"reversed":false,"trim_zeros":"none","regular_triangle":false}}],"derivation":{"root":"n-7c9c430277778c10","steps":["basis A007318","(\u03b8+1)\u00b2"],"edges":["e-6b35c87aff3afcfc","e-652526bb00c47fb6"],"text":"A161198 \u2192 basis A007318 \u2192 (\u03b8+1)\u00b2"},"headline":"A161198 \u2192 basis A007318 \u2192 (\u03b8+1)\u00b2","chain":null}