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v[1] = 6 + 19*x + 15*x^2; for(n = 1, N, my(i = n + 1); v[i] = ((19*n + 22 + (125*n + 139)*x + (321*n + 345)*x^2 + (403*n + 421)*x^3 + (248*n + 253)*x^4 + (60*n + 60)*x^5)*v[i - 1] - (12 + 98*x + 328*x^2 + 576*x^3 + 560*x^4 + 286*x^5 + 60*x^6)*deriv(v[i - 1], x))/(1 + 3*x + 3*x^2 + 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-5a70a6e97131d437","steps":["x \u21a6 x+1","x \u21a6 x/(x+1)"],"edges":["e-4e787ca2d31dd33d","e-20d31343bfc0613b"],"text":"A064861 \u2192 x \u21a6 x+1 \u2192 x \u21a6 x/(x+1)"},"headline":"A064861 \u2192 x \u21a6 x+1 \u2192 x \u21a6 x/(x+1)","chain":null}