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

Terms

a(0) =0a(1) =0a(2) =0a(3) =48a(4) =600a(5) =3108a(6) =10388a(7) =27328a(8) =61668a(9) =124900a(10) =233288a(11) =409008a(12) =681408a(13) =1088388a(14) =1677900a(15) =2509568a(16) =3656428a(17) =5206788a(18) =7266208a(19) =9959600a(20) =13433448a(21) =17858148a(22) =23430468a(23) =30376128a(24) =38952500a(25) =49451428a(26) =62202168a(27) =77574448a(28) =95981648a(29) =117884100