%I M1738 #13 Jan 30 2015 21:56:28
%S 0,1,2,7,12,30,54,127,226,508,930,2046,3780,8182,15288,32767,61680,
%T 131042,248346,524284
%N Number of free subsets of multiplicative group of GF(2^n).
%D P. Bouchard and Y.-N. Yeh, Finding f-free subsets of maximal cardinality, Séries Formelles et Combinatoire Algébrique, 4th colloquium, 15-19 Juin 1992, Montréal, Université du Québec à Montréal, pp. 11-17.
%D N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%K nonn
%O 1,3
%A _Simon Plouffe_