748924domain: NAppears in sequencesa(n) = Sum_{k=0..n} binomial(k, 6*(n-k)).at n=24A293169Number of compositions of 7*n-3 into parts 6 and 7.at n=20A373935a(n) = Sum_{k=0..floor(n/2)} binomial(k,3*(n-2*k)).at n=48A392253