Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1000-1000-1100-0111 pattern in any orientation.
A147104
Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1000-1000-1100-0111 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) =33a(15) =33a(16) =93a(17) =93a(18) =429a(19) =429a(20) =2069a(21) =2069a(22) =10289a(23) =10289a(24) =55429a(25) =55429a(26) =387995a(27) =387995
External references
- oeis: A147104