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A007234 Number of (x -> x^2)-free subsets of symmetric group.
(Formerly M3523)
0
0, 1, 4, 16, 72, 522, 3642, 30753 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

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..8.

CROSSREFS

Sequence in context: A129872 A059371 A208528 * A096244 A030131 A091530

Adjacent sequences:  A007231 A007232 A007233 * A007235 A007236 A007237

KEYWORD

nonn,more

AUTHOR

Simon Plouffe

STATUS

approved

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Last modified November 12 19:41 EST 2019. Contains 329078 sequences. (Running on oeis4.)