Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1001-1111 pattern in any orientation.
A146623
Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1001-1111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =3a(8) =1a(9) =5a(10) =1a(11) =7a(12) =5a(13) =21a(14) =13a(15) =69a(16) =33a(17) =309a(18) =131a(19) =1529a(20) =465a(21) =8153a(22) =2505a(23) =52849a(24) =18109a(25) =418127a(26) =137539a(27) =4312045a(28) =1253575a(29) =52848473
External references
- oeis: A146623