Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-1111-1000 pattern in any orientation.
A146721
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-1111-1000 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =5a(5) =21a(6) =49a(7) =265a(8) =1337a(9) =7025a(10) =55305a(11) =543439a(12) =6271235a(13) =94294061a(14) =1709408045a(15) =38060613237
External references
- oeis: A146721