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v[1] = 1; for(n = 1, N, my(i = n + 1); v[i] = (5 + (2*n - 2)*x)*v[i - 1] + (x - 4*x^2)*deriv(v[i - 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-8919a5e7419ba068","steps":["\u03b3"],"edges":["e-a5ce40235f8a7dd2"],"text":"A257607 \u2192 \u03b3"},"headline":"A257607 \u2192 \u03b3","chain":null}