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Flatten","pari":"P(N) = {my(v = vector(N + 1)); v[1] = 0; v[2] = 15 + 18*x; for(n = 2, N, my(i = n + 1); v[i] = ((5*n + 15*n*x + 9*n*x^2)*v[i - 1])/(n - 1)); 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-b30e7a5b4198051a","steps":["basis A013610","D"],"edges":["e-707e884996971c57","e-35a63cfa1625b0ca"],"text":"A272866 \u2192 basis A013610 \u2192 D"},"headline":"A272866 \u2192 basis A013610 \u2192 D","chain":null}
