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v[1] = 1; for(n = 2, N, my(i = n); v[i] = 2*x*v[i - 1] + (x + x^2)*deriv(v[i - 1], x)); v};\nrow(n, p) = {my(c = Vecrev(p)); c = concat(c, vector(n - #c)); 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":true}}],"derivation":{"root":"n-2cabfd060b04f15d","steps":["\u03b8+1"],"edges":["e-3829ab8c6f8b03f0"],"text":"A131689 \u2192 \u03b8+1"},"headline":"A131689 \u2192 \u03b8+1","chain":null}
