Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1000-1111-0100-0100 pattern in any orientation.
A146825
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1000-1111-0100-0100 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =9a(9) =9a(10) =33a(11) =33a(12) =81a(13) =81a(14) =501a(15) =501a(16) =9765a(17) =9765a(18) =253829a(19) =253829a(20) =5201161a(21) =5201161
External references
- oeis: A146825