Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 110-111-010 pattern in any orientation.
A146242
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 110-111-010 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =5a(7) =5a(8) =17a(9) =17a(10) =55a(11) =55a(12) =445a(13) =445a(14) =7601a(15) =7601a(16) =166611a(17) =166611a(18) =5058693a(19) =5058693a(20) =255201297a(21) =255201297a(22) =21434365863a(23) =21434365863
External references
- oeis: A146242