A007231 - OEIS

A007231

Number of free subsets of multiplicative group of GF(3^n).
(Formerly M3835)

1, 5, 13, 52, 121, 455, 1093, 4305, 9841, 36905, 88573, 348728, 797161, 2989355, 7174453, 28585712, 64570081, 242137805, 581130733, 2288202262

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OFFSET

1,2

REFERENCES

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.

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

LINKS

Table of n, a(n) for n=1..20.

CROSSREFS

Sequence in context: A151274 A149538 A149539 * A158345 A372370 A328494

Adjacent sequences: A007228 A007229 A007230 * A007232 A007233 A007234

KEYWORD

nonn

AUTHOR

Simon Plouffe

STATUS

approved