Number of ways to place 3 nonattacking knights on an n X n toroidal board.

Terms

a(0) =0a(1) =0a(2) =6a(3) =208a(4) =600a(5) =3252a(6) =10584a(7) =27584a(8) =61992a(9) =125300a(10) =233772a(11) =409584a(12) =682084a(13) =1089172a(14) =1678800a(15) =2510592a(16) =3657584a(17) =5208084a(18) =7267652a(19) =9961200a(20) =13435212a(21) =17860084a(22) =23432584a(23) =30378432a(24) =38955000a(25) =49454132a(26) =62205084