65325542domain: NAppears in sequencesExpansion of 1/(1-x^2*(1+x)^3).at n=30A116090Number of compositions of 5*n into parts 2 and 5.at n=18A369840a(n) = Sum_{k=0..floor(3*n/5)} binomial(3*n-3*k,2*k).at n=15A375307