-6920domain: ZAppears in sequencesExpansion of (1+x^2)/(1+x^2+x^5).at n=63A088002G.f. A(x) satisfies: 1/(1 + x) = A(x)*A(x^2)^2*A(x^3)^3*A(x^4)^4* ... *A(x^k)^k* ...at n=31A307657a(n) = Sum_{k=0..n} (-1)^k * binomial(5*k,n-k).at n=11A360089