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2, x] + (7 + 8*x)*P[n - 1, x]];\nTable[CoefficientList[P[n, x], x], {n, 0, 9}] // Flatten","pari":"P(N) = {my(v = vector(N + 1)); v[1] = 1; v[2] = 7 + 8*x; for(n = 2, N, my(i = n + 1); v[i] = -(9 + 24*x + 16*x^2)*v[i - 2] + (7 + 8*x)*v[i - 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-79ebafb266da3b41","steps":["basis A013609","basis A013609"],"edges":["e-1a56a7670c2d3c41","e-b5e583a37877ae6a"],"text":"A172431 \u2192 basis A013609 \u2192 basis A013609"},"headline":"A172431 \u2192 basis A013609 \u2192 basis A013609","chain":null}