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v[1] = 1; v[2] = 2 + 3*x; v[3] = 4 + 13*x + 10*x^2; v[4] = 5 + 27*x + 46*x^2 + 25*x^3; for(n = 4, N, my(i = n + 1); v[i] = (-(1 + 14*x + 81*x^2 + 254*x^3 + 476*x^4 + 550*x^5 + 385*x^6 + 150*x^7 + 25*x^8)*v[i - 4] + (2 + 18*x + 62*x^2 + 108*x^3 + 102*x^4 + 50*x^5 + 10*x^6)*v[i - 2])/(1 + 4*x + 6*x^2 + 4*x^3 + x^4)); 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-4e0b19699f4cf0db","steps":["D+1","x \u21a6 x/(x+1)"],"edges":["e-b1073907eb08b9b5","e-40ea2901f037f838"],"text":"A026374 \u2192 D+1 \u2192 x \u21a6 x/(x+1)"},"headline":"A026374 \u2192 D+1 \u2192 x \u21a6 x/(x+1)","chain":null}