185624domain: NAppears in sequencesa(n) = Sum_{k=0..n-3} T(n,k) * T(n,k+3), with T given by A026714.at n=6A027204Number of 5Xn 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 0 and 1 1 1 vertically.at n=7A207349