A121951 - OEIS

A121951

Number of isomeric aza-benzenoids with three nitrogen atoms and n hexagons.

3, 14, 109, 730, 4918, 32043, 204417, 1277866, 7860506, 47678819

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OFFSET

1,1

REFERENCES

N. Trinajstich, Z. Jericevic, J. V. Knop, W. R. Muller and K. Szymanski, "Computer generation of isomeric structures", Pure and Appl. Chem., vol. 55 (1983) pp. 379-390.

LINKS

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

EXAMPLE

If n=5 then the number of isomeric aza-benzenoids with three nitrogen atoms is 4918. Here n is the number of hexagons.

CROSSREFS

Sequence in context: A246731 A349584 A258298 * A276751 A085244 A265001

Adjacent sequences: A121948 A121949 A121950 * A121952 A121953 A121954

KEYWORD

nonn

AUTHOR

Parthasarathy Nambi, Sep 04 2006

STATUS

approved