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A006924 Number of trivalent graphs of girth exactly 4 and 2n nodes.
(Formerly M1526) 		+0
1
0, 1, 2, 5, 20, 101, 743, 7350, 91763, 1344782, 22160335, 401278984 (list; graph; listen)
OFFSET

2,3
REFERENCES

Gordon Royle, personal communication.

CRC Handbook of Combinatorial Designs, 1996, p. 647.

CROSSREFS

Adjacent sequences: A006921 A006922 A006923 this_sequence A006925 A006926 A006927

Sequence in context: A020001 A039909 A009551 this_sequence A006867 A019536 A129949

KEYWORD

nonn

AUTHOR

njas

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Last modified October 9 14:06 EDT 2008. Contains 144831 sequences.

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