Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1010-1111-0010 pattern in any orientation.
A146628
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 1010-1111-0010 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) =4157a(15) =4157a(16) =84741a(17) =84741a(18) =2465029a(19) =2465029a(20) =97708135a(21) =97708135
External references
- oeis: A146628