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v[1] = 1; v[2] = 3 + 4*x; for(n = 2, N, my(i = n + 1); v[i] = (-(3*n - 3 + (9*n - 9)*x + (9*n - 9)*x^2 + (3*n - 3)*x^3)*v[i - 2] + (n + 2 + (2*n + 5)*x + (n + 3)*x^2)*v[i - 1])/(1 + 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-ff69dadb0811f5e6","steps":["x \u21a6 x/(x+1)"],"edges":["e-894866904e1ba3ac"],"text":"A327997 \u2192 x \u21a6 x/(x+1)"},"headline":"A327997 \u2192 x \u21a6 x/(x+1)","chain":null}
