Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1100-1111-0100-0100 pattern in any orientation.
A147472
Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1100-1111-0100-0100 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) =5a(11) =5a(12) =9a(13) =9a(14) =19a(15) =19a(16) =55a(17) =55a(18) =245a(19) =245a(20) =1021a(21) =1021a(22) =4107a(23) =4107a(24) =20679a(25) =20679
External references
- oeis: A147472