Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 11011-01110-00100 pattern in any orientation.
A147486
Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 11011-01110-00100 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =2a(7) =1a(8) =3a(9) =1a(10) =5a(11) =1a(12) =12a(13) =3a(14) =33a(15) =8a(16) =104a(17) =23a(18) =411a(19) =63a(20) =1754a(21) =191a(22) =8637a(23) =685a(24) =51410a(25) =3493
External references
- oeis: A147486