Number of ways to place 5 nonattacking kings on a 5 X n board.

Terms

a(0) =0a(1) =0a(2) =15a(3) =194a(4) =1974a(5) =9856a(6) =34475a(7) =95466a(8) =224589a(9) =468854a(10) =893646a(11) =1585850a(12) =2656976a(13) =4246284a(14) =6523909a(15) =9693986a(16) =13997775a(17) =19716786a(18) =27175904a(19) =36746514a(20) =48849626a(21) =63959000a(22) =82604271a(23) =105374074a(24) =132919169a(25) =165955566a(26) =205267650a(27) =251711306a(28) =306217044a(29) =369793124