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6*x)*P[n - 2, x] + (10 + 6*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] = 8 + 6*x; for(n = 2, N, my(i = n + 1); v[i] = -(7 - 6*x)*v[i - 2] + (10 + 6*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-5733d79f45a14084","steps":["basis A008288","basis A013609"],"edges":["e-28556ceb40718bbf","e-e28e3453f2d6ded1"],"text":"A013620 \u2192 basis A008288 \u2192 basis A013609"},"headline":"A013620 \u2192 basis A008288 \u2192 basis A013609","chain":null}