OFFSET
1,2
LINKS
Eric Weisstein's World of Mathematics, Graph Cycle
Eric Weisstein's World of Mathematics, Sierpinski Carpet Graph
FORMULA
a(2) = 7^8 - 6^8.
CROSSREFS
KEYWORD
nonn,hard,more,bref
AUTHOR
Eric W. Weisstein, May 01 2019
STATUS
approved