OFFSET
1,1
LINKS
Andrew Howroyd, Table of n, a(n) for n = 1..6
Eric Weisstein's World of Mathematics, Hanoi Graph.
Eric Weisstein's World of Mathematics, Irredundant Set.
CROSSREFS
KEYWORD
nonn
AUTHOR
Eric W. Weisstein, May 23 2019
EXTENSIONS
a(4) onwards from Andrew Howroyd, Aug 08 2024
STATUS
approved