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A038176 A038175/2. 0
0, 1, 6, 27, 128, 572, 2560, 11248, 49152 (list; graph; refs; listen; history; internal format)
OFFSET

2,3

REFERENCES

B. N. Cyvin et al., Isomer enumeration of unbranched catacondensed polygonal systems with pentagons and heptagons, Match, No. 34 (Oct 1996), pp. 109-121.

CROSSREFS

Sequence in context: A030297 A045500 A109115 * A104745 A184279 A174634

Adjacent sequences:  A038173 A038174 A038175 * A038177 A038178 A038179

KEYWORD

nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

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Last modified February 15 23:53 EST 2012. Contains 205860 sequences.