Number of ways to place 5 nonattacking kings on an n X n cylindrical chessboard.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =655a(5) =26952a(6) =309869a(7) =1998752a(8) =9124848a(9) =33065040a(10) =101473009a(11) =274593648a(12) =673080928a(13) =1522931256a(14) =3224953725a(15) =6458355776a(16) =12330557912a(17) =22588294464a(18) =39908439249a(19) =68290845520a(20) =113579839128a(21) =184145882536a(22) =291764365485a(23) =452734505952a(24) =689287992800