A119708 Number of free hexagonal polygons of symmetry class D_(3h) and area n.

0, 0, 1, 1, 0, 1, 1, 0, 1, 4, 0, 3, 4, 0, 3, 12, 0, 6, 19, 0, 10, 41, 0, 16, 72, 0, 28, 149, 0, 50, 72, 0, 87, 557, 0

Offset

1,10

References

Markus Voege, Anthony J. Guttmann and Iwan Jensen, "On the number of benzenoid hydrocarbons", J. Chem. Inf. Comput. Sci., (2002), vol. 42, 456-466.

Links

Table of n, a(n) for n=1..35.

Crossrefs

Cf. A121212, A121211, A121210, A120991.

Sequence in context: A363728 A362562 A316260 * A106142 A092512 A060568

Adjacent sequences: A119705 A119706 A119707 * A119709 A119710 A119711

Keyword

nonn

Author

N. J. A. Sloane, Aug 27 2006

Status

approved