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A121973 Number of isomeric aza-benzenoids with six nitrogen atoms. 0
1, 10, 187, 2802, 35384, 388936, 3862098, 35475697, 306558871, 2521963738 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

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 six nitrogen atoms is 35384. Here n is the number of hexagons.

CROSSREFS

Sequence in context: A239764 A179521 A211102 * A223146 A239765 A006409

Adjacent sequences:  A121970 A121971 A121972 * A121974 A121975 A121976

KEYWORD

nonn

AUTHOR

Parthasarathy Nambi, Sep 05 2006

STATUS

approved

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Last modified November 16 22:20 EST 2019. Contains 329208 sequences. (Running on oeis4.)