Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 11100-00100-00111 pattern in any orientation.
A147252
Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 11100-00100-00111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =1a(9) =1a(10) =1a(11) =1a(12) =3a(13) =3a(14) =7a(15) =7a(16) =15a(17) =15a(18) =31a(19) =31a(20) =125a(21) =125a(22) =537a(23) =537a(24) =2497a(25) =2497a(26) =11379
External references
- oeis: A147252