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

Terms

a(0) =1a(1) =28a(2) =259a(3) =1968a(4) =9386a(5) =30842a(6) =82738a(7) =192336a(8) =400277a(9) =763984a(10) =1360797a(11) =2291056a(12) =3681226a(13) =5687022a(14) =8496534a(15) =12333352a(16) =17459691a(17) =24179516a(18) =32841667a(19) =43842984a(20) =57631432a(21) =74709226a(22) =95635956a(23) =121031712a(24) =151580209