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v[1] = 1; v[2] = 3 + x; v[3] = 10 + 7*x + x^2; v[4] = 25 + 29*x + 10*x^2 + x^3; for(n = 4, N, my(i = n + 1); v[i] = -(25 + 50*x + 35*x^2 + 10*x^3 + x^4)*v[i - 4] + (10 + 10*x + 2*x^2)*v[i - 2]); 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+1"],"edges":["e-b1073907eb08b9b5","e-6a9ddfa19e5c8e04"],"text":"A026374 \u2192 D+1 \u2192 x \u21a6 x+1"},"headline":"A026374 \u2192 D+1 \u2192 x \u21a6 x+1","chain":null}