Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 0110-1111-0110 pattern in any orientation.
A146922
Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 0110-1111-0110 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =2a(8) =2a(9) =3a(10) =3a(11) =4a(12) =7a(13) =10a(14) =20a(15) =28a(16) =50a(17) =87a(18) =154a(19) =310a(20) =595a(21) =1182a(22) =2674a(23) =5267a(24) =14968a(25) =30208a(26) =93503a(27) =203129a(28) =637081a(29) =1541997
External references
- oeis: A146922