Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 111-110-111 pattern in any orientation.
A146284
Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 111-110-111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =5a(9) =9a(10) =17a(11) =25a(12) =55a(13) =133a(14) =419a(15) =1009a(16) =4455a(17) =14333a(18) =61219a(19) =207501a(20) =982915a(21) =4258653a(22) =26235061a(23) =130258871a(24) =1014665059a(25) =6176852821
External references
- oeis: A146284