Number of (n+1) X (n+1) 0..2 arrays with every 2 X 2 subblock summing to 4 and no 2 X 2 subblock having exactly two nonzero entries.

A251142

Number of (n+1) X (n+1) 0..2 arrays with every 2 X 2 subblock summing to 4 and no 2 X 2 subblock having exactly two nonzero entries.

Terms

    a(0) =13a(1) =49a(2) =143a(3) =401a(4) =1061a(5) =2763a(6) =7101a(7) =18193a(8) =46575a(9) =119441a(10) =307045a(11) =791499a(12) =2045725

External references