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Search: id:A121952
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| A121952 |
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Number of isomeric aza-benzenoids with four nitrogen atoms and n hexagons. |
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+0
1
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| 3, 22, 194, 1620, 12982, 98765, 720519, 5073805, 34707100, 231739037
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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 four nitrogen atoms is 12982. Here n is the number of hexagons.
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CROSSREFS
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Sequence in context: A065204 A001393 A046743 this_sequence A098618 A006783 A001409
Adjacent sequences: A121949 A121950 A121951 this_sequence A121953 A121954 A121955
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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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