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v[1] = 1; v[2] = 6 + 2*x; for(n = 2, N, my(i = n + 1); v[i] = (5 + 2*x)*v[i - 2] + 2*x*deriv(v[i - 2], 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-ac04e52510a48bb5","steps":["basis A013609","basis A008277"],"edges":["e-3f48f2d5eb407d05","e-c7a3aa317edb2fe3"],"text":"A249139 \u2192 basis A013609 \u2192 basis A008277"},"headline":"A249139 \u2192 basis A013609 \u2192 basis A008277","chain":null}