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v[1] = 1; for(n = 1, N, my(i = n + 1); v[i] = ((21*n^2 + 27*n + 12 + (10*n^2 + 10*n)*x)*v[i - 1] - (54*n - 48 + (57*n - 24)*x + 15*n*x^2)*deriv(v[i - 1], x) + (72 + 96*x + 42*x^2 + 6*x^3)*deriv(deriv(v[i - 1], x), x))/(n^2 + 7*n + 12)); 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-047228a38014e6d4","steps":["x \u21a6 x+1","x \u21a6 x+1"],"edges":["e-0c759266bd791ca5","e-c3c466da8e0e3b10"],"text":"A056939 \u2192 x \u21a6 x+1 \u2192 x \u21a6 x+1"},"headline":"A056939 \u2192 x \u21a6 x+1 \u2192 x \u21a6 x+1","chain":null}