Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1111-1111 pattern in any orientation.
A146940
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1111-1111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =3a(4) =5a(5) =9a(6) =19a(7) =60a(8) =189a(9) =892a(10) =3177a(11) =18960a(12) =89571a(13) =754227a(14) =4905159a(15) =53337014a(16) =466215312a(17) =6729449504a(18) =78188089715
External references
- oeis: A146940