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v[1] = 1; for(n = 1, N, my(i = n + 1); v[i] = (4 + x)*v[i - 1] + (3 + x)*deriv(v[i - 1], x)); 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-bdae5aa3d1cac0ec","steps":["x \u21a6 x+1","x \u21a6 x+1"],"edges":["e-73e4f5467288c90f","e-2cf6d86d3c754dfa"],"text":"A137597 \u2192 x \u21a6 x+1 \u2192 x \u21a6 x+1"},"headline":"A137597 \u2192 x \u21a6 x+1 \u2192 x \u21a6 x+1","chain":null}