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A186728 Number of connected regular graphs with n nodes and girth at least 8. 12
1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 4, 1, 14, 1, 156, 1, 4338, 1, 266363, 1, 20807689, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,31

REFERENCES

M. Meringer, Fast Generation of Regular Graphs and Construction of Cages. Journal of Graph Theory, 30 (1999), 137-146.

LINKS

Table of n, a(n) for n=0..47.

Jason Kimberley, Connected regular graphs with girth at least 8

Jason Kimberley, Index of sequences counting connected k-regular simple graphs with girth at least g

M. Meringer, Tables of Regular Graphs

FORMULA

a(n) = sum of the n-th row of A186718.

CROSSREFS

Connected regular graphs of any degree with girth at least g: A005177 (g=3), A186724 (g=4), A186725 (g=5), A186726 (g=6), A186727 (g=7), this sequence (g=8), A186729 (g=9).

Connected k-regular simple graphs with girth at least 8: this sequence (any k), A186718 (triangle); specific k: A185118 (k=2), A014376 (k=3).

Sequence in context: A074389 A051119 A159269 * A158298 A009191 A229969

Adjacent sequences:  A186725 A186726 A186727 * A186729 A186730 A186731

KEYWORD

nonn,hard,more

AUTHOR

Jason Kimberley, Nov 25 2011

STATUS

approved

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Last modified July 4 01:48 EDT 2020. Contains 335436 sequences. (Running on oeis4.)