Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1000-1111-0001 pattern in any orientation.
A147271
Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1000-1111-0001 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =3a(6) =9a(7) =23a(8) =45a(9) =169a(10) =1061a(11) =6743a(12) =40273a(13) =284761a(14) =2852385a(15) =36414365a(16) =522818739a(17) =8493813357a(18) =169218922641
External references
- oeis: A147271