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286 + (429*n - 858)*x)*P[n - 2, x] + (2*n - 4 + (3*n - 6)*x)*P[n - 1, x])/(n - 2)]];\nTable[CoefficientList[P[n, x], x], {n, 0, 9}] // Flatten","pari":"P(N) = {my(v = vector(N + 1)); v[1] = 2; v[2] = 26 + 39*x; v[3] = 338 + 1014*x + 18*x^2; for(n = 3, N, my(i = n + 1); v[i] = ((143*n - 286 + (429*n - 858)*x)*v[i - 2] + (2*n - 4 + (3*n - 6)*x)*v[i - 1])/(n - 2)); 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-2a67b0774691ba3b","steps":["basis A013610"],"edges":["e-537a2c184630f963"],"text":"A153651 \u2192 basis A013610"},"headline":"A153651 \u2192 basis A013610","chain":null}