1147796domain: NAppears in sequencesNumber of compositions of 6*n-2 into parts 5 and 6.at n=20A373962a(n) = Sum_{k=0..floor(3*n/5)} binomial(k+2,3*n-5*k).at n=38A390034Expansion of 1 / ((1-x)^5 - x^6).at n=20A390045