-21250domain: ZAppears in sequencesExpansion of Product_{m>=1} ((1+q^(2*m-1))/(1+q^(2*m)))^6.at n=24A029843Expansion of ((1+x)^3 - x^3)/((1+x)^5 - x^5).at n=16A105369a(n) = Sum_{k>=0} (-1)^k*binomial(n,5*k+3).at n=17A289388a(n) = Sum_{k>=0} (-1)^k*binomial(n,5*k+4).at n=17A289389