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8 + (9*n - 18)*x)*P[n - 1, x])/(n - 2)]];\nTable[CoefficientList[P[n, x], x], {n, 0, 9}] // Flatten","pari":"P(N) = {my(v = vector(N + 1)); v[1] = 1; v[2] = 2 + 3*x; v[3] = 4 + 12*x + 9*x^2; for(n = 3, N, my(i = n + 1); v[i] = ((4*n - 8 + (9*n - 18)*x)*v[i - 1])/(n - 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-df53153327eff8f9","steps":["basis A013610"],"edges":["e-5261b7812a78bb52"],"text":"A024462 \u2192 basis A013610"},"headline":"A024462 \u2192 basis A013610","chain":null}