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v[1] = 1; for(n = 1, N, my(i = n + 1); v[i] = ((7 + 38*x + 31*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-efce1b6c07b70e1a","steps":["basis A013611","x \u21a6 x/(x+1)"],"edges":["e-83999c64158b130e","e-c8fff62771a28e41"],"text":"A013613 \u2192 basis A013611 \u2192 x \u21a6 x/(x+1)"},"headline":"A013613 \u2192 basis A013611 \u2192 x \u21a6 x/(x+1)","chain":null}