Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 110-111-011 pattern in any orientation.
A146253
Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 110-111-011 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =3a(7) =3a(8) =5a(9) =5a(10) =9a(11) =9a(12) =19a(13) =19a(14) =71a(15) =71a(16) =265a(17) =265a(18) =1031a(19) =1031a(20) =4533a(21) =4533a(22) =26975a(23) =26975a(24) =188011a(25) =188011a(26) =1487007a(27) =1487007a(28) =13567107a(29) =13567107
External references
- oeis: A146253