Number of inequivalent (mod D_4) ways five checkers can be placed on an n X n board.
A242358
Number of inequivalent (mod D_4) ways five checkers can be placed on an n X n board.
Terms
- a(0) =23a(1) =567a(2) =6814a(3) =47358a(4) =239511a(5) =954226a(6) =3207212a(7) =9414828a(8) =24862239a(9) =60136329a(10) =135311658a(11) =286229762a(12) =574460495a(13) =1101240084a(14) =2028333848a(15) =3605765688a(16) =6211552455a(17) =10402472811a(18) =16984387958a(19) =27099325638a(20) =42342870823a(21) =64905898662a(22) =97761436356a(23) =144885584740a(24) =211543443215
External references
- oeis: A242358