%I A100548
%S A100548 1,1,1,28,2539,847126,987474781,4267529230672,71328353711113801,
%T A100548 4706871807383903992060,1236666872833000506726110479,
%U A100548 1297665884376581511952494336126664
%N A100548 Number of n-node labeled digraphs without endpoints.
%F A100548 E.g.f.: exp(3/2*x^2)*Sum(2^(n*(n-1))*(x/exp(3*x))^n/n!, n=0..infinity).
%Y A100548 Cf. A059167.
%Y A100548 Sequence in context: A060335 A004705 A007219 this_sequence A103660 A107444 
               A061787
%Y A100548 Adjacent sequences: A100545 A100546 A100547 this_sequence A100549 A100550 
               A100551
%K A100548 nonn
%O A100548 0,4
%A A100548 Goran Kilibarda, Zoran Maksimovic, Vladeta Jovovic (vladeta(AT)eunet.rs), 
               Jan 02 2005