Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1000-1111-0001-0001 pattern in any orientation.
A147394
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1000-1111-0001-0001 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =3a(7) =7a(8) =15a(9) =27a(10) =67a(11) =281a(12) =1263a(13) =5491a(14) =23639a(15) =128337a(16) =894617a(17) =7261755a(18) =63564439a(19) =605898697a(20) =6745478781a(21) =88749999709
External references
- oeis: A147394