Number of non-equivalent ways to place 5 non-attacking kings on an n X n board.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =273a(5) =5335a(6) =50021a(7) =291171a(8) =1263125a(9) =4434783a(10) =13355477a(11) =35672426a(12) =86686721a(13) =194886975a(14) =410820269a(15) =819819261a(16) =1561128613a(17) =2853802623a(18) =5033838173a(19) =8602315716a(20) =14291999441a(21) =23150803815a(22) =36654054741a(23) =56841404455a(24) =86496828245a(25) =129363299967a(26) =190419751685a(27) =276205278030