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A027667
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Number of independent subsets of nodes of 3^n cube (P_3 X ... X P_3).
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3
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OFFSET
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0,1
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LINKS
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Table of n, a(n) for n=0..4.
Sean A. Irvine, Java program (github)
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EXAMPLE
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For n=0, the two sets are the empty set and a set containing a single isolated vertex. - Sean A. Irvine, Nov 16 2019
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CROSSREFS
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Cf. A027624 (P_2), A027668 (P_4).
Sequence in context: A134590 A012978 A012949 * A076630 A270389 A350956
Adjacent sequences: A027664 A027665 A027666 * A027668 A027669 A027670
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KEYWORD
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nonn,nice,hard,more
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AUTHOR
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R. H. Hardin
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EXTENSIONS
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a(0) corrected by Sean A. Irvine, Nov 16 2019
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STATUS
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approved
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