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v[1] = 1; v[2] = 0; v[3] = 1 + x; v[4] = 4 + 4*x; for(n = 5, N, my(i = n); v[i] = (1 + x)*v[i - 4] + (2 + 2*x)*v[i - 3] + x*v[i - 2] + 2*v[i - 1]); 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":["Veronese 2","x \u21a6 x+1"],"edges":["e-09c23808357cf31f","e-6e0556923b9c3af7"],"text":"A122542 \u2192 Veronese 2 \u2192 x \u21a6 x+1"},"headline":"A122542 \u2192 Veronese 2 \u2192 x \u21a6 x+1","chain":null}