Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in an em 1,1 1,2 2,2 2,3 3,3 in any orientation.
A146151
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in an em 1,1 1,2 2,2 2,3 3,3 in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =3a(4) =9a(5) =27a(6) =119a(7) =633a(8) =3943a(9) =30791a(10) =332473a(11) =4676705a(12) =79725173a(13) =1817184081a(14) =50545874411
External references
- oeis: A146151