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v[1] = 1; for(n = 1, N, my(i = n + 1); v[i] = (-(2*n^3 + 7*n^2 + 7*n + 2 - (3*n^3 - 12*n^2 - 5*n + 20)*x - (2*n^3 - 2*n^2 - 19*n + 40)*x^2 + (11*n - 17)*x^3 + (2*n - 2)*x^4)*v[i - 1] - ((4*n^2 + 8*n + 4)*x - (7*n^2 - 10*n - 33)*x^2 - (2*n^2 - 2*n - 44)*x^3 + 17*x^4 + 2*x^5)*deriv(v[i - 1], x))/(-2*n^3 - 3*n^2 - n + (4*n^3 - 12*n^2 + 8*n + 6)*x - (10*n - 13)*x^2 - (4*n - 4)*x^3)); 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-353fb5a029e4e669","steps":["D+1"],"edges":["e-1945cad536bc16ce"],"text":"A207607 \u2192 D+1"},"headline":"A207607 \u2192 D+1","chain":null}