Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1110-0111-0001 pattern in any orientation.
A147403
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1000-1110-0111-0001 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =9a(9) =25a(10) =37a(11) =81a(12) =207a(13) =659a(14) =1525a(15) =5011a(16) =16955a(17) =78955a(18) =307577a(19) =1539617a(20) =6559267a(21) =39653567a(22) =197073411a(23) =1351045655
External references
- oeis: A147403