72932904domain: NAppears in sequencesa(n) = Sum_{k=0..n-3} T(n,k) * T(n,k+3), with T given by A026374.at n=10A026949a(n) = Sum_{k=0..n-3} T(n,k) * T(n,k+3), with T given by A026386.at n=10A026954