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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 (list; graph; refs; listen; history; text; internal format)
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

Table of n, a(n) for n=1..11.

Erich Friedman, Math Magic (September 2012)

CROSSREFS

Sequence in context: A257878 A243700 A193796 * A258930 A002797 A049920

Adjacent sequences:  A249903 A249904 A249905 * A249907 A249908 A249909

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

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Last modified September 19 18:37 EDT 2020. Contains 337181 sequences. (Running on oeis4.)