2504932domain: NAppears in sequencesQuintisection of 1/(1-x^5-x^6).at n=26A099132Number of compositions of 6*n-2 into parts 5 and 6.at n=21A373962a(n) = Sum_{k=0..floor(3*n/5)} binomial(k+2,3*n-5*k).at n=40A390034