Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0100-0100-1111-0010 pattern in any orientation.
A147029
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0100-0100-1111-0010 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =9a(9) =9a(10) =33a(11) =33a(12) =81a(13) =81a(14) =593a(15) =593a(16) =11281a(17) =11281a(18) =273235a(19) =273235a(20) =6759617a(21) =6759617
External references
- oeis: A147029