Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1100-0100-1111 pattern in any orientation.
A146652
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1100-0100-1111 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) =265a(13) =265a(14) =2569a(15) =2569a(16) =62981a(17) =62981a(18) =1534149a(19) =1534149a(20) =39874393a(21) =39874393
External references
- oeis: A146652