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Number of independent subsets of nodes of 3^n cube (P_3 X ... X P_3).
3

%I #8 Nov 19 2019 05:56:54

%S 2,5,63,70633,25090373284177

%N Number of independent subsets of nodes of 3^n cube (P_3 X ... X P_3).

%H Sean A. Irvine, <a href="https://github.com/archmageirvine/joeis/blob/master/src/irvine/oeis/a027/A027667.java">Java program</a> (github)

%e For n=0, the two sets are the empty set and a set containing a single isolated vertex. - _Sean A. Irvine_, Nov 16 2019

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

%K nonn,nice,hard,more

%O 0,1

%A _R. H. Hardin_

%E a(0) corrected by _Sean A. Irvine_, Nov 16 2019