Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0111-0001-0001 pattern in any orientation.

A147287

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0111-0001-0001 pattern in any orientation.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =25a(9) =41a(10) =113a(11) =265a(12) =1045a(13) =2597a(14) =10607a(15) =34895a(16) =213407a(17) =913033a(18) =6860785a(19) =33581603

External references