Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-1111-1000 pattern in any orientation.
A146720
Number of n X n binary arrays symmetric under 90 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) =1a(5) =1a(6) =5a(7) =17a(8) =43a(9) =65a(10) =175a(11) =507a(12) =1901a(13) =7015a(14) =35249a(15) =143079a(16) =849399a(17) =4342589a(18) =31597665a(19) =199056275a(20) =1767268871
External references
- oeis: A146720