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v[1] = 1; v[2] = 3 + 5*x; for(n = 2, N, my(i = n + 1); v[i] = (-(3 + 7*x + 5*x^2 + x^3)*v[i - 2] + (4 + 10*x + 6*x^2)*v[i - 1])/(1 + x)); 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-71965e79e47a4526","steps":["basis A008288","x \u21a6 x/(x+1)"],"edges":["e-9c90c90150c15b0e","e-ee46f41159813d70"],"text":"A013609 \u2192 basis A008288 \u2192 x \u21a6 x/(x+1)"},"headline":"A013609 \u2192 basis A008288 \u2192 x \u21a6 x/(x+1)","chain":null}