154235domain: NAppears in sequencesa(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026670.at n=8A026982Number of n X 5 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 1 1 0 vertically.at n=12A207108