A038140 - OEIS

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A038140 - OEIS

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A038140

Number of planar polyhexes with n cells and a single hole of size at least 2.

3

0, 0, 0, 0, 0, 0, 0, 1, 5, 43, 283, 1954, 12363, 76283, 453946, 2641506

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OFFSET

1,9

LINKS

Table of n, a(n) for n=1..16.

Sven J. Cyvin, Jon Brunvoll, Björg N. Cyvin, John L. Bergan, and E. Brendsdal, The simplest coronoids: hollow hexagons, Struct. Chem., 2 (1991), 555-566.

J. V. Knop, W. R. Mueller, K. Szymanski, and N. Trinajstic, Use of small computers for large computations: enumeration of polyhex hydrocarbons, J. Chem. Inf. Comput. Sci., 30 (1990), 159-160.

CROSSREFS

Cf. A018190, A038141, A323930, A038144.

Sequence in context: A221874 A317282 A182191 * A178826 A082311 A269121

Adjacent sequences: A038137 A038138 A038139 * A038141 A038142 A038143

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane

EXTENSIONS

Name clarified by Andrey Zabolotskiy, Feb 17 2023

STATUS

approved