Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1001-1001-1111 pattern in any orientation.
A147412
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1001-1001-1111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =5a(6) =17a(7) =41a(8) =185a(9) =633a(10) =2157a(11) =7997a(12) =47735a(13) =277209a(14) =2208471a(15) =17450513a(16) =197122185a(17) =2176282667a(18) =31077679505
External references
- oeis: A147412