Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1010-1111-0100 pattern in any orientation.
A146640
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1010-1111-0100 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =5a(7) =17a(8) =43a(9) =75a(10) =161a(11) =539a(12) =2129a(13) =8565a(14) =42667a(15) =183445a(16) =1039641a(17) =5959305a(18) =43560487a(19) =311334093a(20) =2752013037
External references
- oeis: A146640