2982723523domain: NAppears in sequencesExpansion of 1/(1 - x^2/(1-x)^5).at n=22A369803a(n) = Sum_{k=0..floor(3*n/5)} binomial(3*n-3*k,2*k).at n=18A375307a(n) = Sum_{k=0..floor(2*n/5)} binomial(2*n-3*k,2*k).at n=27A391541