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v[1] = 1; v[2] = 3 + x; v[3] = 12 + 8*x + x^2; v[4] = 60 + 64*x + 17*x^2 + x^3; for(n = 4, N, my(i = n + 1); v[i] = (-(n^6 - 9*n^5 + 32*n^4 - 59*n^3 + 63*n^2 - 40*n + 12 + (2*n^6 - 18*n^5 + 64*n^4 - 118*n^3 + 126*n^2 - 80*n + 24)*x + (n^6 - 9*n^5 + 32*n^4 - 59*n^3 + 63*n^2 - 40*n + 12)*x^2)*v[i - 4] - (4*n^4 - 18*n^3 + 32*n^2 - 30*n + 12 + (6*n^4 - 28*n^3 + 52*n^2 - 50*n + 20)*x + (2*n^4 - 10*n^3 + 20*n^2 - 20*n + 8)*x^2)*v[i - 3] + (2*n^4 - 8*n^3 + 8*n^2 - 6 + (2*n^4 - 8*n^3 + 8*n^2 + 2*n - 8)*x - (n^2 - 3*n + 3)*x^2)*v[i - 2] + (4*n^2 - 10*n + 10 + (2*n^2 - 6*n + 6)*x)*v[i - 1])/(n^2 - 3*n + 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-08ac2c6d9914754c","steps":["D+1","x \u21a6 x+1"],"edges":["e-966c24255e4e84d9","e-c1b29872ce1914d9"],"text":"A154986 \u2192 D+1 \u2192 x \u21a6 x+1"},"headline":"A154986 \u2192 D+1 \u2192 x \u21a6 x+1","chain":null}