Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 2X2 elbow 1,1 1,2 2,1 in any orientation.
A145942
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 2X2 elbow 1,1 1,2 2,1 in any orientation.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =13a(4) =59a(5) =335a(6) =2897a(7) =37715a(8) =690357a(9) =17737939a(10) =624778919a(11) =31083795113
External references
- oeis: A145942