Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 2X3 U in any orientation.
A146056
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 2X3 U in any orientation.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =5a(5) =1a(6) =21a(7) =9a(8) =145a(9) =29a(10) =1925a(11) =153a(12) =28297a(13) =2069a(14) =734141a(15) =42313a(16) =33360929a(17) =973281a(18) =2205341673a(19) =38746505a(20) =212529048997a(21) =2736250609a(23) =283141781389
External references
- oeis: A146056