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v[1] = 1; v[2] = 2 + x; v[3] = 7 + 8*x + x^2; v[4] = 26 + 55*x + 18*x^2 + x^3; for(n = 4, N, my(i = n + 1); v[i] = (-(12*n - 36 + (15*n - 45)*x + (3*n - 9)*x^2)*v[i - 2] - ((15*n - 45)*x + (6*n - 18)*x^2)*deriv(v[i - 2], x) - (3*n - 9)*x^2*deriv(deriv(v[i - 2], x), x) + (8*n - 24 + (4*n - 12)*x)*v[i - 1] + (4*n - 12)*x*deriv(v[i - 1], x))/(n - 3)); 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-fbab854f2622405b","steps":["basis A008277"],"edges":["e-1d9d834688f391fd"],"text":"A146987 \u2192 basis A008277"},"headline":"A146987 \u2192 basis A008277","chain":null}