A027667 Number of independent subsets of nodes of 3^n cube (P_3 X ... X P_3).

2, 5, 63, 70633, 25090373284177

Offset: 0

Author

R. H. Hardin

Keywords

• nonn
• nice
• hard
• more

Examples

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

Links

• Sean A. Irvine, Java program (github)

Crossrefs

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

Extensions

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