340006domain: NAppears in sequencesBinomial transform of the expansion of 1/(1-x^5-x^6).at n=19A107025Expansion of 1 / ((1-x)^5 - x^6).at n=18A390045a(n) = Sum_{k=0..floor(3*n/5)} binomial(k,3*n-5*k).at n=38A392271