-7371domain: ZAppears in sequencesa(n) = (3^n/n!) * Product_{k=0..n-1} (3*k - 2).at n=6A004989Triangle, read by rows, where the n-th row lists the (2*n+1) coefficients of (1 + x - 3*x^2)^n.at n=60A084614Expansion of a(q) * b(q)^2 in powers of q where a(), b() are cubic AGM theta functions.at n=32A181976