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A249906
a(n) is the index of the first occurrence of n in A249905, or -1 if n does not occur.
2
1, 0, -1, 3, 2, 5, 9, 13, 89, 485, 4891
OFFSET
1,4
COMMENTS
a(n) is the smallest number of Hamiltonian cycles up to direction which requires at least an n-vertex graph to realize.
LINKS
Erich Friedman, Math Magic (September 2012)
CROSSREFS
Sequence in context: A257878 A243700 A193796 * A258930 A002797 A049920
KEYWORD
sign,hard,more
AUTHOR
Jeremy Tan, Nov 08 2014
EXTENSIONS
a(10)-a(11) using data from Johan de Ruiter added by Jeremy Tan, Nov 02 2018
STATUS
approved