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%I M3523 #14 Jan 31 2015 09:55:18
%S 0,1,4,16,72,522,3642,30753
%N Number of (x -> x^2)-free subsets of symmetric group.
%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,more
%O 1,3
%A _Simon Plouffe_
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