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v[1] = 1; v[2] = 1 + 2*x; v[3] = 2 + 8*x + 7*x^2; v[4] = 2 + 16*x + 33*x^2 + 20*x^3; for(n = 5, N, my(i = n); v[i] = (-(x^2 + 4*x^3 + 6*x^4 + 4*x^5 + x^6)*v[i - 4] - (2*x + 10*x^2 + 18*x^3 + 14*x^4 + 4*x^5)*v[i - 3] - (1 + 4*x + 7*x^2 + 6*x^3 + 2*x^4)*v[i - 2] + (2 + 8*x + 10*x^2 + 4*x^3)*v[i - 1])/(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-b0fc620949fb5990","steps":["D+1","x \u21a6 x/(x+1)"],"edges":["e-87cb78b62855bfe8","e-e372aa40f8738674"],"text":"A122542 \u2192 D+1 \u2192 x \u21a6 x/(x+1)"},"headline":"A122542 \u2192 D+1 \u2192 x \u21a6 x/(x+1)","chain":null}