Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1010-1111-0100 pattern in any orientation.
A146636
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1010-1111-0100 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) =49a(11) =49a(12) =309a(13) =309a(14) =4193a(15) =4193a(16) =83267a(17) =83267a(18) =2435243a(19) =2435243a(20) =97883893a(21) =97883893
External references
- oeis: A146636