Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 110-111-001 pattern in any orientation.
A146234
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 110-111-001 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) =113a(11) =113a(12) =1393a(13) =1393a(14) =59521a(15) =59521a(16) =1585365a(17) =1585365a(18) =62771429a(19) =62771429a(20) =6390256297a(21) =6390256297
External references
- oeis: A146234