Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 3X3 el 1,1 1,2 1,3 2,3 3,3 in any orientation.
A146037
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 3X3 el 1,1 1,2 1,3 2,3 3,3 in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =3a(4) =7a(5) =19a(6) =89a(7) =399a(8) =1939a(9) =11793a(10) =102715a(11) =985113a(12) =13989079a(13) =211198639a(14) =4331591655a(15) =98297746517
External references
- oeis: A146037