A121140 Numbers of isomers of unbranched a-4-catapolyheptagons - see Brunvoll reference for precise definition.

1, 3, 21, 116, 692, 3776, 20216, 104448

Offset

3,2

References

J. Brunvoll, S. J. Cyvin and B. N. Cyvin, Isomer enumeration of polygonal systems..., J. Molec. Struct. (Theochem), 364 (1996), 1-13.

Links

Table of n, a(n) for n=3..10.

Crossrefs

Sequence in context: A080952 A183404 A309670 * A005057 A092634 A178537

Adjacent sequences: A121137 A121138 A121139 * A121141 A121142 A121143

Keyword

nonn

Author

N. J. A. Sloane, Aug 13 2006

Status

approved