Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 110-111-110 pattern in any orientation.
A146269
Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 110-111-110 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =2a(7) =1a(8) =4a(9) =1a(10) =8a(11) =3a(12) =26a(13) =9a(14) =95a(15) =20a(16) =374a(17) =59a(18) =1990a(19) =238a(20) =12488a(21) =1339a(22) =98678a(23) =8950a(24) =945523a(25) =63227a(26) =10649014a(27) =541368a(28) =148952527
External references
- oeis: A146269