3866110domain: NAppears in sequencesNumber of (n+1)X(3+1) 0..1 arrays with every 2X2 subblock having one or two 1s.at n=6A251321Number of (n+1)X(7+1) 0..1 arrays with every 2X2 subblock having one or two 1s.at n=2A251325T(n,k)=Number of (n+1)X(k+1) 0..1 arrays with every 2X2 subblock having one or two 1s.at n=38A251326