The On-Line Encyclopedia of Integer Sequences (OEIS)

A185136 revision #4

A185136

Number of not necessarily connected 3-regular simple graphs on 2n vertices with girth exactly 6.

0, 0, 0, 0, 0, 0, 0, 1, 1, 5, 32, 385, 7573, 181224, 4624481, 122089999, 3328899592, 93988909792

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OFFSET

0,10

LINKS

FORMULA

a(n) = A006926(n) + A185036(n).

CROSSREFS

KEYWORD

nonn,hard,more

AUTHOR

Jason Kimberley, Mar 21 2012

STATUS

approved