%I M2077
%S 2,15,74,409,1951,9765,48827,256347,1220699,6103515,30517572,
%T 160216158,762939452,3814697265,19073486293,101327896117,476837158134
%N Number of free subsets of multiplicative group of GF(5^n).
%C Observe that a(4*n+2) = (5^(4*n+3)  5)/8 for n = 0,1,2,3. Does this result hold for general n?  _Peter Bala_, Mar 22 2018
%D P. Bouchard and Y.N. Yeh, Finding ffree subsets of maximal cardinality, Séries Formelles et Combinatoire Algébrique, 4th colloquium, 1519 Juin 1992, Montréal, Université du Québec à Montréal, pp. 1117.
%D N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%Y Cf. A007233.
%K nonn
%O 1,1
%A _Simon Plouffe_
