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A027667 Number of independent subsets of nodes of 3^n cube (P_3 X ... X P_3). 3
2, 5, 63, 70633, 25090373284177 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..4.

Sean A. Irvine, Java program (github)

EXAMPLE

For n=0, the two sets are the empty set and a set containing a single isolated vertex. - Sean A. Irvine, Nov 16 2019

CROSSREFS

Cf. A027624 (P_2), A027668 (P_4).

Sequence in context: A134590 A012978 A012949 * A076630 A270389 A350956

Adjacent sequences:  A027664 A027665 A027666 * A027668 A027669 A027670

KEYWORD

nonn,nice,hard,more

AUTHOR

R. H. Hardin

EXTENSIONS

a(0) corrected by Sean A. Irvine, Nov 16 2019

STATUS

approved

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Last modified May 27 11:47 EDT 2022. Contains 354097 sequences. (Running on oeis4.)