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v[1] = 1; for(n = 1, N, my(i = n + 1); v[i] = ((2*n + 2 + 3*x)*v[i - 1] + (4 + 6*x + 2*x^2)*deriv(v[i - 1], x))/(2*n - 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-c8c19eba9d68881f","steps":["2\u03b8+1","x \u21a6 x+1"],"edges":["e-c4ea45619bc7f60a","e-65d8be712199b442"],"text":"A007318 \u2192 2\u03b8+1 \u2192 x \u21a6 x+1"},"headline":"A007318 \u2192 2\u03b8+1 \u2192 x \u21a6 x+1","chain":null}