A249906 a(n) is the index of the first occurrence of n in A249905, or -1 if n does not occur.

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

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