Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1000-1000-1000-1111 pattern in any orientation.
A147096
Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1000-1000-1000-1111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =3a(9) =3a(10) =7a(11) =7a(12) =15a(13) =15a(14) =31a(15) =31a(16) =73a(17) =73a(18) =307a(19) =307a(20) =1451a(21) =1451a(22) =6775a(23) =6775a(24) =33773a(25) =33773a(26) =192865
External references
- oeis: A147096