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A122676
Number of unbranched catacondensed azulenoids with n carbon atoms and C_s symmetry.
0
0, 0, 2, 12, 54, 256, 1141
OFFSET
1,3
LINKS
J. Brunvoll, S. J. Cyvin and B. N. Cyvin, Azulenoids, MATCH, No. 34, 1996, 91-108.
CROSSREFS
Sequence in context: A145766 A181765 A198150 * A038175 A181541 A197230
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Sep 23 2006
STATUS
approved