Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 11110-01111 pattern in any orientation.
A147508
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 11110-01111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =3a(6) =9a(7) =23a(8) =81a(9) =267a(10) =1053a(11) =6173a(12) =40853a(13) =301993a(14) =2684783a(15) =27089119a(16) =322029889a(17) =4723820567a(18) =81998776493
External references
- oeis: A147508