A122671 Number of catacondensed coronoid systems with n hexagons with a single hole.

1, 3, 15, 62, 312, 1435, 6785

Offset

8,2

Links

Table of n, a(n) for n=8..14.

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

Crossrefs

Cf. A038140.

Sequence in context: A218227 A072336 A356421 * A317181 A067562 A062211

Adjacent sequences: A122668 A122669 A122670 * A122672 A122673 A122674

Keyword

nonn,more

Author

N. J. A. Sloane, Sep 23 2006

Extensions

Name clarified by Andrey Zabolotskiy, Feb 16 2023

Status

approved