1295022domain: NAppears in sequencesa(n) = Sum_{k <= n/2 } binomial(n-2k, 3k).at n=29A137356Expansion of 1/(1 - x^3/(1-x)^5).at n=18A369804a(n) = Sum_{k=0..floor(2*n/3)} binomial(2*k+1,2*n-3*k).at n=21A392454