Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1000-1100-0111 pattern in any orientation.
A146391
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1000-1100-0111 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) =85a(11) =85a(12) =693a(13) =693a(14) =9501a(15) =9501a(16) =265597a(17) =265597a(18) =10400895a(19) =10400895a(20) =596407005a(21) =596407005
External references
- oeis: A146391