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v[1] = 1; for(n = 1, N, my(i = n + 1); v[i] = ((2*n - 1 + (7*n - 2)*x + (5*n - 1)*x^2)*v[i - 1])/(1 + x)); 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-849de7332df28657","steps":["basis A013610","x \u21a6 x/(x+1)"],"edges":["e-678ee1ecc620a9a6","e-bf7e95c91509ee5d"],"text":"A088996 \u2192 basis A013610 \u2192 x \u21a6 x/(x+1)"},"headline":"A088996 \u2192 basis A013610 \u2192 x \u21a6 x/(x+1)","chain":null}