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A121950
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Number of isomeric aza-benzenoids with two nitrogen atoms and n hexagons.
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0
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OFFSET
| 1,1
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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.
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EXAMPLE
| If n=5 then the number of isomeric aza-benzenoids with two nitrogen atoms is 1326. Here n is the number of hexagons.
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CROSSREFS
| Sequence in context: A181296 A065982 A114693 * A086853 A036918 A200540
Adjacent sequences: A121947 A121948 A121949 * A121951 A121952 A121953
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KEYWORD
| nonn
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AUTHOR
| Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Sep 04 2006
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