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v[1] = 1; v[2] = 2 + 4*x; for(n = 3, N, my(i = n); v[i] = (-(n - 2 + (8*n - 16)*x + (22*n - 44)*x^2 + (24*n - 48)*x^3 + (9*n - 18)*x^4)*v[i - 2] + (n + (5*n - 2)*x + (7*n - 4)*x^2 + (3*n - 2)*x^3)*v[i - 1])/(1 + 2*x + x^2)); 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-c9dce8c25621fdea","steps":["basis A013609","x \u21a6 x/(x+1)"],"edges":["e-0705555781f6cbb3","e-6f8d85a320897a8d"],"text":"A046716 \u2192 basis A013609 \u2192 x \u21a6 x/(x+1)"},"headline":"A046716 \u2192 basis A013609 \u2192 x \u21a6 x/(x+1)","chain":null}