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v[1] = 0; v[2] = 2; for(n = 2, N, my(i = n + 1); v[i] = ((2*n + 4 + (n + 2)*x)*v[i - 1] + (2 + 4*x + x^2)*deriv(v[i - 1], x))/(n - 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-9b5c7e97e5191da6","steps":["basis A013609","D"],"edges":["e-3133312db52cd60e","e-e15d9f9474f6c5e9"],"text":"A110441 \u2192 basis A013609 \u2192 D"},"headline":"A110441 \u2192 basis A013609 \u2192 D","chain":null}