A121951 Number of isomeric aza-benzenoids with three nitrogen atoms and n hexagons.

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

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