Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 3X3 el 1,1 1,2 1,3 2,3 3,3 in any orientation.
A146031
Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 3X3 el 1,1 1,2 1,3 2,3 3,3 in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =47a(7) =87a(8) =827a(9) =1813a(10) =23847a(11) =61833a(12) =1905275a(13) =6035973a(14) =614447855a(15) =2474833329a(16) =318082536355
External references
- oeis: A146031