1273690domain: NAppears in sequences(6n+5)-th terms of expansion of 1/(1 - x - x^6).at n=9A099242a(n) = Sum_{k=0..floor(n/2)} binomial(3*n-5*k-1,k).at n=20A373653a(n) = Sum_{k=0..floor(n/3)} binomial(2*n-5*k-1,k).at n=30A373654