Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0100-1100-0111 pattern in any orientation.
A146580
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0100-1100-0111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =17a(9) =17a(10) =57a(11) =57a(12) =457a(13) =457a(14) =7575a(15) =7575a(16) =206575a(17) =206575a(18) =7284891a(19) =7284891a(20) =429058537a(21) =429058537a(22) =43146239725a(23) =43146239725
External references
- oeis: A146580