A122688 Irregular triangle read by rows giving numbers of azulenoid isomers (see Brunvoll et al. for precise definition).

0, 0, 2, 0, 13, 4, 0, 75, 40, 11, 2, 455, 319, 122, 35, 5, 0, 2782, 2428, 1159, 408, 101, 19, 0

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