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v[1] = 1; for(n = 1, N, my(i = n + 1); v[i] = (-(2*n - 3 - (4*n^2 - 22*n + 21)*x - (12*n^2 - 50*n + 40)*x^2 - (12*n^2 - 42*n + 30)*x^3 - (4*n^2 - 12*n + 8)*x^4)*v[i - 1] + (2 - (8*n - 28)*x - (32*n - 88)*x^2 - (48*n - 116)*x^3 - (32*n - 70)*x^4 - (8*n - 16)*x^5)*deriv(v[i - 1], x) + (4*x + 20*x^2 + 40*x^3 + 40*x^4 + 20*x^5 + 4*x^6)*deriv(deriv(v[i - 1], x), 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-7d781fe2b71cdf22","steps":["x \u21a6 x/(x+1)"],"edges":["e-b263fbf8ba55adb2"],"text":"A176230 \u2192 x \u21a6 x/(x+1)"},"headline":"A176230 \u2192 x \u21a6 x/(x+1)","chain":null}