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A122688 Irregular triangle read by rows giving numbers of azulenoid isomers (see Brunvoll et al. for precise definition). 0
0, 0, 2, 0, 13, 4, 0, 75, 40, 11, 2, 455, 319, 122, 35, 5, 0, 2782, 2428, 1159, 408, 101, 19, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

REFERENCES

J. Brunvoll, S. J. Cyvin and B. N. Cyvin, Azulenoids, MATCH, No. 34, 1996, 91-108.

LINKS

Table of n, a(n) for n=1..24.

EXAMPLE

Triangle begins:

0

0

2 0

13 4 0

75 40 11 2

455 319 122 35 5 0

2782 2428 1159 408 101 19 0

CROSSREFS

Sequence in context: A294463 A107700 A274107 * A293936 A110685 A225480

Adjacent sequences:  A122685 A122686 A122687 * A122689 A122690 A122691

KEYWORD

nonn,tabf

AUTHOR

N. J. A. Sloane, Sep 23 2006

STATUS

approved

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Last modified September 17 22:53 EDT 2019. Contains 327147 sequences. (Running on oeis4.)