63928domain: NAppears in sequencesa(n) = 5^n - 4^n + 3^n.at n=7A083325a(n) = Sum_{k=0..3} binomial(6,k)*binomial(n,k).at n=27A247608Number of length n+7 0..1 arrays with at most two downsteps in every 7 consecutive neighbor pairs.at n=9A256815