40164domain: NAppears in sequencesa(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026670.at n=7A026982Number of permutations of 1..n with no five elements in correct or reverse order.at n=8A095818Antidiagonal sums of A177517.at n=29A186426