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Search: id:A121950
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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
1
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| 2, 10, 48, 243, 1326, 7349, 41030, 228694, 1270663, 7031737
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OFFSET
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1,1
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REFERENCES
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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
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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
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Sequence in context: A054138 A065982 A114693 this_sequence A086853 A036918 A166922
Adjacent sequences: A121947 A121948 A121949 this_sequence A121951 A121952 A121953
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KEYWORD
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nonn
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AUTHOR
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Parthasarathy Nambi (PachaNambi(AT)yahoo.com), Sep 04 2006
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