Number of ways to place 2 nonattacking kings on an n X n X n raumschach board.

Terms

a(0) =0a(1) =0a(2) =0a(3) =193a(4) =1548a(5) =6714a(6) =21280a(7) =55395a(8) =125748a(9) =257908a(10) =489024a(11) =870885a(12) =1473340a(13) =2388078a(14) =3732768a(15) =5655559a(16) =8339940a(17) =12009960a(18) =16935808a(19) =23439753a(20) =31902444a(21) =42769570a(22) =56558880a(23) =73867563a(24) =95379988a(25) =121875804a(26) =154238400a(27) =193463725a(28) =240669468a(29) =297104598