89211domain: NAppears in sequencesa(n) = A027113(n, 2n-6).at n=10A027124Number of (n+2) X 6 0..1 arrays with every 3 X 3 subblock having three equal elements in a row horizontally, vertically or nw-to-se diagonally exactly three ways, and new values 0..1 introduced in row major order.at n=19A204377