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v[1] = 1; v[2] = 2 + 4*x; for(n = 3, N, my(i = n); v[i] = (-(2 - (n - 13)*x - (5*n - 34)*x^2 - (9*n - 43)*x^3 - (7*n - 26)*x^4 - (2*n - 6)*x^5)*v[i - 2] - (x + 6*x^2 + 14*x^3 + 16*x^4 + 9*x^5 + 2*x^6)*deriv(v[i - 2], x) + (3 - (n - 13)*x - (3*n - 19)*x^2 - (3*n - 11)*x^3 - (n - 2)*x^4)*v[i - 1] + (x + 4*x^2 + 6*x^3 + 4*x^4 + x^5)*deriv(v[i - 1], x))/(1 + 2*x + x^2)); v};\nrow(n, p) = {my(c = Vecrev(p)); c};\nT(N) = {my(v = P(N)); concat(vector(#v, i, row(i, v[i])))};\nT(10)","reading":{"first_row":1,"offset":1,"reversed":false,"trim_zeros":"none","regular_triangle":false}}],"derivation":{"root":"n-6aaec68d653cbdb0","steps":["\u03b8+1","x \u21a6 x/(x+1)"],"edges":["e-8098d1403de01053","e-d7b30cda47196554"],"text":"A143494 \u2192 \u03b8+1 \u2192 x \u21a6 x/(x+1)"},"headline":"A143494 \u2192 \u03b8+1 \u2192 x \u21a6 x/(x+1)","chain":null}