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A121974 Number of isomeric aza-benzenoids with eight nitrogen atoms. 0
1, 42, 1410, 32326, 561378, 8069192, 101090191, 1141425811, 11879179287 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,2

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=2..10.

EXAMPLE

If n=5 then the number of isomeric aza-benzenoids with eight nitrogen atoms is 32326. Here n is the number of hexagons.

CROSSREFS

Sequence in context: A230939 A238537 A077123 * A096048 A215301 A258492

Adjacent sequences:  A121971 A121972 A121973 * A121975 A121976 A121977

KEYWORD

nonn

AUTHOR

Parthasarathy Nambi, Sep 05 2006

STATUS

approved

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Last modified June 17 19:10 EDT 2019. Contains 324198 sequences. (Running on oeis4.)