

A022562


Number of connected clawfree unlabeled graphs on n nodes.


3



1, 1, 2, 5, 14, 50, 191, 881, 4494, 26389, 184749, 1728404, 23805256, 491544474
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OFFSET

1,3


REFERENCES

R. Faudree, E. Flandrin and Z. Ryjacek, Clawfree graphs  a survey, Discr. Math., 164 (1997), 87147.


LINKS

Table of n, a(n) for n=1..14.
Gordon Royle, 1728404 distinct 12vertex connected clawfree graphs
Gordon Royle, g6 format
Eric Weisstein's World of Mathematics, ClawFree Graph


CROSSREFS

Cf. A022563, A022564, A058929.
Sequence in context: A224978 A006390 A100597 * A115340 A000109 A049338
Adjacent sequences: A022559 A022560 A022561 * A022563 A022564 A022565


KEYWORD

nonn,nice


AUTHOR

N. J. A. Sloane.


EXTENSIONS

Corrected and extended by Gordon Royle, May 16 2003
Term a(14) added by Gordon F. Royle, Aug 06 2008


STATUS

approved



