Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 00100-00100-11111-00100 pattern in any orientation.
A147331
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 00100-00100-11111-00100 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =5a(7) =21a(8) =42a(9) =179a(10) =648a(11) =2171a(12) =10276a(13) =78975a(14) =494260
External references
- oeis: A147331