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v[1] = 1; for(n = 2, N, my(i = n); v[i] = ((2*n - 1 + (4*n + 2)*x + (2*n + 3)*x^2)*v[i - 1])/(1 + x)); v};\nrow(n, p) = {my(c = Vecrev(p)); c};\nT(N) = {my(v = P(N)); concat(vector(#v, i, row(i, v[i])))};\nT(10)","reading":{"first_row":1,"offset":1,"reversed":false,"trim_zeros":"none","regular_triangle":false}}],"derivation":{"root":"n-7c9c430277778c10","steps":["basis A013609","x \u21a6 x/(x+1)"],"edges":["e-5c9ad73da84eb2a7","e-de855dd80514847d"],"text":"A161198 \u2192 basis A013609 \u2192 x \u21a6 x/(x+1)"},"headline":"A161198 \u2192 basis A013609 \u2192 x \u21a6 x/(x+1)","chain":null}