Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 11000-01100-00110-00011 pattern in any orientation.
A147450
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 11000-01100-00110-00011 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =1a(9) =13a(10) =27a(11) =49a(12) =163a(13) =479a(14) =1319a(15) =4265a(16) =14651a(17) =50725a(18) =219167a(19) =1062605a(20) =5322067a(21) =29208507
External references
- oeis: A147450