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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
OFFSET
0,1
LINKS
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
KEYWORD
nonn,nice,hard,more
AUTHOR
EXTENSIONS
a(0) corrected by Sean A. Irvine, Nov 16 2019
STATUS
approved