Number of ways to place 4 non-attacking wazirs on an n X n toroidal board.

Terms

a(0) =0a(1) =0a(2) =0a(3) =228a(4) =3850a(5) =27225a(6) =122892a(7) =423152a(8) =1213380a(9) =3046025a(10) =6907890a(11) =14454972a(12) =28330822a(13) =52586065a(14) =93218400a(15) =158854080a(16) =261593552a(17) =418045617a(18) =650576150a(19) =988799100a(20) =1471339170a(21) =2147897257a(22) =3081651412a(23) =4352027760a(24) =6057877500a(25) =8321097785a(26) =11290735962