A038147 Number of polyhexes with n cells.

1, 1, 3, 7, 22, 83, 341, 1519, 7114, 34350

Offset

1,3

Comments

The sequence is from Knop et al. According to Cyvin, Brunvoll, and Cyvin, a(8)-a(10) "are probably wrong". See also my comment to A038145. - Andrei Zabolotskii, Apr 02 2026

Links

Table of n, a(n) for n=1..10.

Björg N. Cyvin, Jon Brunvoll, and Sven J. Cyvin, Enumeration of benzenoid systems and other polyhexes, Advances in the Theory of Benzenoid Hydrocarbons II, Springer, 1992. See Table 9 on p. 86.

J. V. Knop, K. Szymanski, Ž. Jeričević, and N. Trinajstić, On the total number of polyhexes, Match, No. 16 (1984), 119-134. See Table 7.

Crossrefs

See A000228 for another version of this sequence.

Cf. A018190, A038143-A038146.

Sequence in context: A187982 A000228 A108070 * A252784 A364627 A082271

Adjacent sequences: A038144 A038145 A038146 * A038148 A038149 A038150

Keyword

nonn,hard,more

Author

N. J. A. Sloane

Status

approved