21308126895domain: NAppears in sequencesa(n) = n^n*binomial(n+2, 2).at n=9A0811339th binomial transform of (0,0,1,0,0,0,...).at n=11A081139a(n) = binomial(n + 4, 4)*9^n.at n=8A173000G.f. A(x) satisfies A(x) = 1 + 9*x*A(x)^(4/3).at n=9A214668