Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-1111-1100 pattern in any orientation.
A147477
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-1111-1100 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =3a(6) =9a(7) =19a(8) =52a(9) =181a(10) =742a(11) =4149a(12) =26078a(13) =174469a(14) =1396213a(15) =13529455
External references
- oeis: A147477