%I #18 May 04 2021 09:49:01
%S 4,10,16,28,36,52,64,82,100
%N a(n) is the least s > 1 for which it is possible to place s nonattacking range-n leprechauns on an s X s board.
%C A range-n leprechaun is a fairy chess piece that can move to any square within range n, and to any square that a queen can move to. A range-1 leprechaun is a queen and a range-2 leprechaun is a superqueen. (Escamocher and O'Sullivan 2021)
%H Guillaume Escamocher and Barry O'Sullivan, <a href="https://doi.org/10.1016/j.disc.2021.112316">Leprechauns on the chessboard</a>, Discrete Mathematics, 344(5), 2021.
%F If n is odd, a(n) = (n+1)^2. If n is even, a(n) > (n+1)^2. (Escamocher and O'Sullivan 2021)
%Y Cf. A343905.
%K nonn,more
%O 1,1
%A _Guillaume Escamocher_, May 03 2021