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v[1] = 1; for(n = 2, N, my(i = n); v[i] = ((2*n - 1 + (4*n + 6)*x + (2*n + 7)*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 A013611","x \u21a6 x/(x+1)"],"edges":["e-1182ea8561b370d4","e-3200191b94a10489"],"text":"A161198 \u2192 basis A013611 \u2192 x \u21a6 x/(x+1)"},"headline":"A161198 \u2192 basis A013611 \u2192 x \u21a6 x/(x+1)","chain":null}