Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1000-1111-1000 pattern in any orientation.
A147130
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1000-1111-1000 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =5a(6) =25a(7) =71a(8) =443a(9) =1859a(10) =9601a(11) =64045a(12) =595391a(13) =5302231a(14) =72852715a(15) =980189123a(16) =19962381129
External references
- oeis: A147130