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400*x^2;\nP[n_, x_] := P[n, x] = Expand[Together[((60*n + 138 + (200*n + 520)*x + 200*x^2)*P[n - 1, x])/(10*n + 13 + 10*x)]];\nTable[CoefficientList[P[n, x], x], {n, 0, 9}] // Flatten","pari":"P(N) = {my(v = vector(N + 1)); v[1] = 276 + 1040*x + 400*x^2; for(n = 1, N, my(i = n + 1); v[i] = ((60*n + 138 + (200*n + 520)*x + 200*x^2)*v[i - 1])/(10*n + 13 + 10*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-bbfc5a54ff13a785","steps":["basis A013611","D+1"],"edges":["e-db3287eb465d1cf9","e-cbb08dce9ad54576"],"text":"A013612 \u2192 basis A013611 \u2192 D+1"},"headline":"A013612 \u2192 basis A013611 \u2192 D+1","chain":null}