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v[1] = 1; v[2] = 9 + 4*x; v[3] = 44 + 44*x + 9*x^2; v[4] = 170 + 264*x + 123*x^2 + 16*x^3; for(n = 4, N, my(i = n + 1); v[i] = -(16 + 32*x + 24*x^2 + 8*x^3 + x^4)*v[i - 4] + (32 + 48*x + 24*x^2 + 4*x^3)*v[i - 3] - (24 + 24*x + 6*x^2)*v[i - 2] + (8 + 4*x)*v[i - 1]); 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-e7d0ffa461d9dbc4","steps":["D+1","x \u21a6 x+1"],"edges":["e-720363525db6d149","e-e11781f57dd368ff"],"text":"A125092 \u2192 D+1 \u2192 x \u21a6 x+1"},"headline":"A125092 \u2192 D+1 \u2192 x \u21a6 x+1","chain":null}