Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-1111-0001 pattern in any orientation.
A146853
Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-1111-0001 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =3a(7) =15a(8) =39a(9) =71a(10) =173a(11) =597a(12) =1851a(13) =6753a(14) =30359a(15) =143255a(16) =790071a(17) =4528523a(18) =29159423a(19) =204966875a(20) =1600354339
External references
- oeis: A146853