Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1110-0111 pattern in any orientation.
A146474
Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1110-0111 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) =3a(11) =3a(12) =9a(13) =9a(14) =23a(15) =23a(16) =85a(17) =85a(18) =375a(19) =375a(20) =2149a(21) =2149a(22) =15299a(23) =15299a(24) =129877a(25) =129877a(26) =1353943a(27) =1353943a(28) =17475557a(29) =17475557
External references
- oeis: A146474