Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-1111-0100-0100 pattern in any orientation.
A147470
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-1111-0100-0100 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =3a(4) =5a(5) =9a(6) =19a(7) =55a(8) =245a(9) =1021a(10) =4107a(11) =20679a(12) =138093a(13) =1077295a(14) =9543083a(15) =95957809a(16) =1121795793a(17) =15620825665a(18) =256368054863
External references
- oeis: A147470