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(170*n+629+(100*n+540)*x+100*x^2)*P(n-1,x) for n >= 1, with P(0,x) = 629 + 540*x + 100*x^2.","mathematica":"P[0, x_] := 629 + 540*x + 100*x^2;\nP[n_, x_] := P[n, x] = Expand[Together[((170*n + 629 + (100*n + 540)*x + 100*x^2)*P[n - 1, x])/(10*n + 27 + 10*x)]];\nTable[CoefficientList[P[n, x], x], {n, 0, 9}] // Flatten","pari":"P(N) = {my(v = vector(N + 1)); v[1] = 629 + 540*x + 100*x^2; for(n = 1, N, my(i = n + 1); v[i] = ((170*n + 629 + (100*n + 540)*x + 100*x^2)*v[i - 1])/(10*n + 27 + 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-a5302200d285579d","steps":["basis A013609","D+1"],"edges":["e-2f341f062a4ee4be","e-60b4d2a108e1e092"],"text":"A038331 \u2192 basis A013609 \u2192 D+1"},"headline":"A038331 \u2192 basis A013609 \u2192 D+1","chain":null}