594236domain: NAppears in sequencesNumber of (n+1) X (2+1) 0..1 arrays with every 2 X 2 subblock having one or two 1s.at n=7A251320T(n,k)=Number of (n+1)X(k+1) 0..1 arrays with every 2X2 subblock having one or two 1s.at n=37A251326