282646domain: NAppears in sequencesa(n) = a(n-1) + a(n-6), with a(i) = 1 for i = 0..5.at n=53A005708(6n+5)-th terms of expansion of 1/(1 - x - x^6).at n=8A099242a(n) = Sum_{k=0..floor(n/2)} binomial(3*n-5*k-1,k).at n=18A373653a(n) = Sum_{k=0..floor(n/3)} binomial(2*n-5*k-1,k).at n=27A373654