Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0110-0110-1111 pattern in any orientation.
A147355
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0110-0110-1111 pattern in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =6a(8) =9a(9) =38a(10) =25a(11) =340a(12) =57a(13) =1815a(14) =551a(15) =17400a(16) =8604a(17) =372235a(18) =122881a(19) =11641876a(20) =1647352a(21) =359458545a(22) =42868635a(23) =13529698097a(24) =1998622860
External references
- oeis: A147355