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v[1] = 1 + 12*x + 26*x^2; for(n = 1, N, my(i = n + 1); v[i] = ((4*n^2 + 14*n + 12 + (22*n^2 + 78*n + 68)*x + (15*n^2 + 69*n + 72)*x^2 - (20*n^2 + 40*n + 12)*x^3 - (17*n^2 + 45*n + 28)*x^4)*v[i - 1] + ((8*n + 13)*x + (41*n + 67)*x^2 + (75*n + 123)*x^3 + (59*n + 97)*x^4 + (17*n + 28)*x^5)*deriv(v[i - 1], x))/(4*n^2 + 14*n + 12 + (8*n^2 + 28*n + 24)*x + (4*n^2 + 14*n + 12)*x^2)); v};\nrow(n, p) = {my(c = Vecrev(p)); c};\nT(N) = {my(v = P(N)); concat(vector(#v, i, row(i - 1, v[i])))};\nT(9)","reading":{"first_row":0,"offset":0,"reversed":false,"trim_zeros":"none","regular_triangle":false}}],"derivation":{"root":"n-24790f2ac2b21c79","steps":["x \u21a6 x/(x+1)"],"edges":["e-c7970f59c2851cd3"],"text":"A370258 \u2192 x \u21a6 x/(x+1)"},"headline":"A370258 \u2192 x \u21a6 x/(x+1)","chain":null}