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v[1] = 1; v[2] = 3 + x; for(n = 2, N, my(i = n + 1); v[i] = (-(n^3 - n + (2*n^3 - 5*n^2 + 7*n)*x + (n^3 - 4*n - 3)*x^2 + (3*n^2 - 8*n + 7)*x^3 + (2*n - 2)*x^4)*v[i - 2] - ((n^2 - n)*x + 2*x^2 - (n^2 - 4*n + 7)*x^3 - (3*n - 7)*x^4 - 2*x^5)*deriv(v[i - 2], x) + (2*n^2 - n - 4 + (2*n^2 - 3*n + 10)*x + (5*n - 9)*x^2 + 2*x^3)*v[i - 1] + ((n - 2)*x - (n - 4)*x^2 - 2*x^3)*deriv(v[i - 1], x))/(n - 2 + 2*x)); 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-9b757b008ff4762d","steps":["D+1"],"edges":["e-b9eeb758a4078f10"],"text":"A112007 \u2192 D+1"},"headline":"A112007 \u2192 D+1","chain":null}