Number of ways to place 5 nonattacking queens on an n X n toroidal board.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =10a(5) =0a(6) =882a(7) =13312a(8) =85536a(9) =561440a(10) =2276736a(11) =9471744a(12) =27991470a(13) =85725696a(14) =209107890a(15) =525062144a(16) =1116665944a(17) =2437807104a(18) =4691672964a(19) =9234168960a(20) =16462896030a(21) =29919532544a(22) =50215537658a(23) =85687824384a(24) =136944081500