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v[1] = 1; v[2] = 1 + 3*x + 2*x^2; for(n = 3, N, my(i = n); v[i] = ((2*n - 1 + (6*n - 3)*x + (4*n - 2)*x^2)*v[i - 1] - (n - 2 + (2*n - 4)*x + (n - 2)*x^2)*v[i - 2])/(n + 1)); v};\nrow(n, p) = {my(c = Vecrev(p)); c};\nT(N) = {my(v = P(N)); concat(vector(#v, i, row(i, v[i])))};\nT(10)","reading":{"first_row":0,"offset":1,"reversed":false,"trim_zeros":"none","regular_triangle":false}}],"derivation":{"root":"n-4e0759372c05411f","steps":[],"edges":[],"text":"A090452"},"headline":"A090452: Scaled array A078740 ((3,2)-Stirling2).","chain":null}