Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1000-1111-0001-0001 pattern in any orientation.
A147396
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1000-1111-0001-0001 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =5a(7) =13a(8) =45a(9) =145a(10) =549a(11) =1997a(12) =9119a(13) =41645
External references
- oeis: A147396