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v[1] = 1; v[2] = 1 + 2*x; for(n = 3, N, my(i = n); v[i] = ((1 + 4*x + 5*x^2 + 2*x^3)*v[i - 2] + (2 + 5*x + 3*x^2)*v[i - 1])/(1 + x)); 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":["x \u21a6 x+1","x \u21a6 x/(x+1)"],"edges":["e-3a1dbaeb4ca6a6b2","e-88bec93db2683b80"],"text":"A122542 \u2192 x \u21a6 x+1 \u2192 x \u21a6 x/(x+1)"},"headline":"A122542 \u2192 x \u21a6 x+1 \u2192 x \u21a6 x/(x+1)","chain":null}