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v[1] = 1; v[2] = 2 + 6*x; for(n = 3, N, my(i = n); v[i] = (-(n - 2 + (12*n - 24)*x + (46*n - 92)*x^2 + (60*n - 120)*x^3 + (25*n - 50)*x^4)*v[i - 2] + (n + (7*n - 4)*x + (11*n - 8)*x^2 + (5*n - 4)*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 A013611","x \u21a6 x/(x+1)"],"edges":["e-5274dd88a300ad29","e-ebe1afb4615c7d8e"],"text":"A046716 \u2192 basis A013611 \u2192 x \u21a6 x/(x+1)"},"headline":"A046716 \u2192 basis A013611 \u2192 x \u21a6 x/(x+1)","chain":null}