Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1001-1001-1111 pattern in any orientation.
A147407
Number of n X n binary arrays symmetric under horizontal and vertical reflection 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) =1a(6) =1a(7) =5a(8) =9a(9) =21a(10) =25a(11) =109a(12) =61a(13) =921a(14) =265a(15) =6141a(16) =2725a(17) =55969a(18) =40501a(19) =883289a(20) =485293a(21) =21802429a(22) =5980517a(23) =645447537a(24) =124941205
External references
- oeis: A147407