Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1000-1111-0001 pattern in any orientation.
A146604
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1000-1111-0001 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) =9a(10) =29a(11) =29a(12) =137a(13) =137a(14) =1079a(15) =1079a(16) =13093a(17) =13093a(18) =250867a(19) =250867a(20) =6233403a(21) =6233403a(22) =218750525a(23) =218750525a(24) =11495073517a(25) =11495073517a(26) =872282781415
External references
- oeis: A146604