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1, x]];\nTable[CoefficientList[P[n, x], x], {n, 0, 9}] // Flatten","pari":"P(N) = {my(v = vector(N + 1)); v[1] = 169 + 234*x + 81*x^2; for(n = 1, N, my(i = n + 1); v[i] = (13 + 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-4397e742863fdbe2","steps":["basis A013610"],"edges":["e-c80be26a429cc3fc"],"text":"A038305 \u2192 basis A013610"},"headline":"A038305 \u2192 basis A013610","chain":null}