Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1101-0111 pattern in any orientation.
A146724
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1101-0111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =25a(9) =25a(10) =197a(11) =197a(12) =1531a(13) =1531a(14) =31791a(15) =31791a(16) =876801a(17) =876801a(18) =39890653a(19) =39890653a(20) =2918403939a(21) =2918403939
External references
- oeis: A146724