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v[1] = 1; for(n = 1, N, my(i = n + 1); v[i] = ((2*n + 2 + (2*n + 7)*x - (2*n - 7)*x^2 - (2*n - 2)*x^3)*v[i - 1] + (2*x + 6*x^2 + 6*x^3 + 2*x^4)*deriv(v[i - 1], x))/(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-f1c436fe49d0588b","steps":["x \u21a6 x/(x+1)"],"edges":["e-e85aa2b309794c94"],"text":"A079621 \u2192 x \u21a6 x/(x+1)"},"headline":"A079621 \u2192 x \u21a6 x/(x+1)","chain":null}