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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] = -3*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-6466a8550c08a52f","steps":["basis A013609","basis A013611"],"edges":["e-0bad92788b2f6169","e-2d0ce0e84daffc92"],"text":"A116414 \u2192 basis A013609 \u2192 basis A013611"},"headline":"A116414 \u2192 basis A013609 \u2192 basis A013611","chain":null}