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v[1] = 9 + 7*x + x^2; for(n = 1, N, my(i = n + 1); v[i] = (2 + x)*v[i - 1] + x*deriv(v[i - 1], x)); 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":["basis A008277"],"edges":["e-72f55bf744a09909"],"text":"A391533 \u2192 basis A008277"},"headline":"A391533 \u2192 basis A008277","chain":null}