%I #2 Apr 30 2014 01:29:21
%S 1,1,3,11,35,114,407,1486,5414,19923,74230,278462,1049318,3972395,
%T 15101658,57607431,220391316,845366406,3250192681,12521965697
%N Number of perfect Skolem sets.
%H G. Nordh, <a href="http://arXiv.org/abs/math.NT/0506155">Perfect Skolem sequences</a>
%Y Cf. A004075, A060963, A099152.
%K nonn
%O 1,3
%A _Ralf Stephan_, Jun 10 2005