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v[1] = 1; v[2] = 3 + 2*x; for(n = 2, N, my(i = n + 1); v[i] = (-(4*n - 2 + (8*n^2 - 18*n + 11)*x + (8*n^3 - 28*n^2 + 38*n - 23)*x^2 + (12*n^2 - 30*n + 20)*x^3 + (4*n - 4)*x^4)*v[i - 2] - ((2*n - 1)*x + (4*n^2 - 10*n + 6)*x^2 - (4*n^2 - 14*n + 12)*x^3 - (6*n - 9)*x^4 - 2*x^5)*deriv(v[i - 2], x) + (6*n - 7 + (8*n^2 - 18*n + 15)*x + (10*n - 11)*x^2 + 2*x^3)*v[i - 1] + ((2*n - 3)*x - (2*n - 5)*x^2 - 2*x^3)*deriv(v[i - 1], x))/(2*n - 3 + 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-d4c21302c908a2cf","steps":["D+1"],"edges":["e-a068b9040b0c255c"],"text":"A008517 \u2192 D+1"},"headline":"A008517 \u2192 D+1","chain":null}