Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1100-1111-0100 pattern in any orientation.
A146708
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1100-1111-0100 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =17a(9) =17a(10) =49a(11) =49a(12) =329a(13) =329a(14) =4511a(15) =4511a(16) =91215a(17) =91215a(18) =2775809a(19) =2775809a(20) =118081991a(21) =118081991
External references
- oeis: A146708