Many excellent designs for a new banner were submitted. We will use the best of them in rotation.
%N Number of n-vertex unlabeled digraphs without endpoints.
%Y Cf. A100548 (labeled case), A004110, A004108, A059166, A059167.
%A Goran Kilibarda, Zoran Maksimovic, _Vladeta Jovovic_, Jan 14 2005