Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 10001-11111 pattern in any orientation.
A147087
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 10001-11111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =3a(9) =5a(10) =9a(11) =15a(12) =27a(13) =43a(14) =124a(15) =355a(16) =1029a(17) =2971a(18) =10017a(19) =31249a(20) =124044a(21) =490643a(22) =2352059a(23) =10915093a(24) =60936189a(25) =323565841a(26) =2097402227
External references
- oeis: A147087