Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a zee 1,1 1,2 2,2 2,3 in any orientation.
A145959
Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a zee 1,1 1,2 2,2 2,3 in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =5a(4) =17a(5) =75a(6) =405a(7) =2821a(8) =26895a(9) =365651a(10) =6440881a(11) =149278281a(12) =4554728635a(13) =183204987539
External references
- oeis: A145959