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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] = 27 + 108*x + 144*x^2 + 64*x^3; for(n = 1, N, my(i = n + 1); v[i] = (2 + 4*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-f48bed27dbc29c5f","steps":["P\u2099 + P\u2099\u208a\u2081","basis A013611"],"edges":["e-0331d381cbbd8a41","e-2c0e83fb0e1d16d7"],"text":"A391533 \u2192 P\u2099 + P\u2099\u208a\u2081 \u2192 basis A013611"},"headline":"A391533 \u2192 P\u2099 + P\u2099\u208a\u2081 \u2192 basis A013611","chain":null}