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

Terms

a(0) =0a(1) =0a(2) =6a(3) =96a(4) =600a(5) =1392a(6) =2156a(7) =10624a(8) =22410a(9) =62400a(10) =82280a(11) =210336a(12) =280540a(13) =495488a(14) =955950a(15) =1332736a(16) =1844976a(17) =2924640a(18) =3933456a(19) =6319200a(20) =7954170a(21) =10648000a(22) =14081980a(23) =19826304a(24) =25502500a(25) =31809856a(26) =41037354a(27) =52338272a(28) =63979916a(29) =84001200