Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1010-1111 pattern in any orientation.
A146423
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1010-1111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =29a(9) =29a(10) =229a(11) =229a(12) =1773a(13) =1773a(14) =39925a(15) =39925a(16) =1086663a(17) =1086663a(18) =55544427a(19) =55544427a(20) =4442151653a(21) =4442151653
External references
- oeis: A146423