394555domain: NAppears in sequencesQuintisection of 1/(1-x^5-x^6).at n=23A099132Expansion of 1/(1 - x^5/(1-x)^6).at n=20A369794a(n) = Sum_{k=0..floor(3*n/5)} binomial(k+2,3*n-5*k).at n=35A390034