A122676 Number of unbranched catacondensed azulenoids with n carbon atoms and C_s symmetry.

0, 0, 2, 12, 54, 256, 1141

Offset

1,3

Links

Table of n, a(n) for n=1..7.

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

Adjacent sequences: A122673 A122674 A122675 * A122677 A122678 A122679

Keyword

nonn

Author

N. J. A. Sloane, Sep 23 2006

Status

approved