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A122672 Number of primitive coronoid systems with n hexagons. 0
1, 1, 3, 2, 11, 12, 40 (list; graph; refs; listen; history; internal format)
OFFSET

8,3

REFERENCES

S. J. Cyvin et al., The simplest coronoids: hollow hexagons, Struct. Chem., 2 (1991), 555-566.

CROSSREFS

Sequence in context: A159610 A074246 A134426 * A194608 A052973 A087956

Adjacent sequences:  A122669 A122670 A122671 * A122673 A122674 A122675

KEYWORD

nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com), Sep 23 2006

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Last modified February 15 16:39 EST 2012. Contains 205823 sequences.