

A323851


Polycyclic aromatic hydrocarbons (for precise definition see He and He, 1986).


3



0, 0, 0, 1, 2, 12, 51, 229, 969, 4098, 16867, 68925, 278907, 1123302, 4507640
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,5


REFERENCES

N. Trinajstić, S. Nikolić, J. V. Knop, W. R. Müller and K. Szymanski, Computational Chemical Graph Theory: Characterization, Enumeration, and Generation of Chemical Structures by Computer Methods, Ellis Horwood, 1991.


LINKS

Table of n, a(n) for n=1..15.
A. T. Balaban, J. Brunvoll, B. N. Cyvin & S. J. Cyvin, Enumeration of branched catacondensed benzenoid hydrocarbons and their numbers of Kekulé structures Tetrahedron, 44(1) (1988), 221228. See Table 1.
Wenchen He and Wenjie He, Generation and enumeration of planar polycyclic aromatic hydrocarbons, Tetrahedron 42.19 (1986): 52915299. See Table 1, column C.


CROSSREFS

Cf. A003104, A323924A323930.
Sequence in context: A012382 A198008 A359523 * A054667 A009537 A057547
Adjacent sequences: A323848 A323849 A323850 * A323852 A323853 A323854


KEYWORD

nonn,more


AUTHOR

N. J. A. Sloane, Feb 09 2019


EXTENSIONS

a(13)a(15) from Trinajstić et al. (Table 4.2, the number of catacondensed benzenoids with h hexagons, branched) added by Andrey Zabolotskiy, Feb 08 2023


STATUS

approved



