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(22*n+44+(20*n+40)*x)*P(n-1,x) for n >= 1, with P(0,x) = 880 + 800*x.","mathematica":"P[0, x_] := 880 + 800*x;\nP[n_, x_] := P[n, x] = Expand[Together[((22*n + 44 + (20*n + 40)*x)*P[n - 1, x])/(n + 1)]];\nTable[CoefficientList[P[n, x], x], {n, 0, 9}] // Flatten","pari":"P(N) = {my(v = vector(N + 1)); v[1] = 880 + 800*x; for(n = 1, N, my(i = n + 1); v[i] = ((22*n + 44 + (20*n + 40)*x)*v[i - 1])/(n + 1)); 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-ec89fb3fc20684fc","steps":["basis A013609","D"],"edges":["e-0c8cc5263f914382","e-dc15e5f1765bfe25"],"text":"A038336 \u2192 basis A013609 \u2192 D"},"headline":"A038336 \u2192 basis A013609 \u2192 D","chain":null}