Number of ways to place 5 nonattacking knights on an n X n board.

Terms

a(0) =0a(1) =0a(2) =2a(3) =340a(4) =9386a(5) =97580a(6) =649476a(7) =3184708a(8) =12472084a(9) =41199404a(10) =119171110a(11) =309957412a(12) =739123094a(13) =1639655452a(14) =3422020324a(15) =6778432292a(16) =12833460256a(17) =23356032940a(18) =41051290730a(19) =69954580804a(20) =115954242034a(21) =187474704860a(22) =296356869496a(23) =458978753668a(24) =697666048844