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2, x] + (6 + 9*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 + 9*x; for(n = 2, N, my(i = n + 1); v[i] = (4 + 9*x)*v[i - 2] + (6 + 9*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-d6b7687ba0ff59dd","steps":["basis A013610","basis A013610"],"edges":["e-dddeff0317c778fa","e-835d73d960f365ca"],"text":"A116412 \u2192 basis A013610 \u2192 basis A013610"},"headline":"A116412 \u2192 basis A013610 \u2192 basis A013610","chain":null}