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A122687 Irregular triangle read by rows giving numbers of azulenoid isomers (see Brunvoll et al. for precise definition). 0
0, 1, 1, 1, 1, 2, 2, 4, 3, 3, 1, 4, 7, 9, 2, 3, 0, 18, 14, 13, 10, 7, 1, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

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

1

1 1

1 2 2

4 3 3 1

4 7 9 2 3 0

18 14 13 10 7 1 1

CROSSREFS

Sequence in context: A209749 A248345 A094953 * A002948 A117113 A239430

Adjacent sequences:  A122684 A122685 A122686 * A122688 A122689 A122690

KEYWORD

nonn,tabf

AUTHOR

N. J. A. Sloane, Sep 23 2006

STATUS

approved

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Last modified August 25 14:26 EDT 2019. Contains 326324 sequences. (Running on oeis4.)