Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1100-0111-1100 pattern in any orientation.
A146679
Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1100-0111-1100 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =2a(9) =1a(10) =4a(11) =1a(12) =8a(13) =3a(14) =27a(15) =9a(16) =93a(17) =19a(18) =312a(19) =52a(20) =1325a(21) =193a(22) =7552a(23) =866a(24) =50022a(25) =4709a(26) =393372a(27) =29160
External references
- oeis: A146679