A038145 Number of n-celled helicenes without holes.

0, 0, 0, 0, 0, 1, 8, 71, 542, 3857

Offset

1,7

Comments

Is this sequence from Knop et al. an erroneous version of A108070(n) - A018190(n)? (Compare with the last column of Table 1 of Brunvoll et al.). If so, A038146 and A038147 are also likely incorrect. - Andrei Zabolotskii, Apr 02 2026

Links

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

J. Brunvoll, S. J. Cyvin, B. N. Cyvin, Zhang Fuji, and Guo Xiaofeng, Theory of helicenic hydrocarbons. Part 4: Further enumerations, Structural Chemistry, 7 (1996), 119-130.

J. V. Knop, K. Szymanski, Ž. Jeričević, and N. Trinajstić, On the total number of polyhexes, Match, No. 16 (1984), 119-134. See Table 6.

Crossrefs

Cf. A018190, A038143-A038147.

Sequence in context: A193102 A390203 A390202 * A198856 A320092 A015576

Adjacent sequences: A038142 A038143 A038144 * A038146 A038147 A038148

Keyword

nonn,more

Author

N. J. A. Sloane

Status

approved