Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 110-100-111 pattern in any orientation.
A146173
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 110-100-111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =9a(7) =9a(8) =33a(9) =33a(10) =89a(11) =89a(12) =853a(13) =853a(14) =34557a(15) =34557a(16) =906369a(17) =906369a(18) =18920177a(19) =18920177a(20) =1254520087a(21) =1254520087a(22) =193995577775a(23) =193995577775
External references
- oeis: A146173