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v[1] = 1; v[2] = 1; v[3] = 1; for(n = 3, N, my(i = n + 1); v[i] = (4*n^2 - 12*n + 8 + (3*n^2 - 9*n + 6)*x)*v[i - 3] + 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-6f93222f142b1c00","steps":["basis A013610","x \u21a6 x+1"],"edges":["e-cb57edcedee099ee","e-e061c0bd91278e18"],"text":"A118931 \u2192 basis A013610 \u2192 x \u21a6 x+1"},"headline":"A118931 \u2192 basis A013610 \u2192 x \u21a6 x+1","chain":null}