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Search: id:A134819
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| A134819 |
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Irregular triangle read by rows: the number of hydrocarbon structures that can be drawn with a given number of carbons and units of unsaturation. |
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+0
2
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| 1, 1, 1, 1, 1, 2, 3, 2, 1, 2, 5, 9, 11, 7, 3, 3, 10, 26, 40, 40, 21, 6, 5, 25, 77, 159, 217, 185, 85, 19, 9, 56, 222, 575, 1031, 1230, 920, 356, 50, 18, 139, 654, 2082, 4679, 7437, 7982, 5308, 1804, 204, 35, 338, 1902, 7244, 19983, 40139, 57771, 56437, 33860, 10064, 832
(list; graph; listen)
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OFFSET
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1,6
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COMMENT
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Computed over a period of several years, and confirmed using the Molgen program.
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REFERENCES
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Molgen, http://molgen.de/?src=documents/publications.
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LINKS
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David A. Consiglio, Jr., Table of n, a(n) for n = 1..99
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EXAMPLE
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Triangle begins:
1
1 1 1
1 2 3 2 1
2 5 9 11 7 3
etc.
a(3,1) = 2 because there are two structures that contain 3 carbons and have 1 unit of unsaturation (propene and cyclopropane)
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CROSSREFS
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Row sums give A134818.
Adjacent sequences: A134816 A134817 A134818 this_sequence A134820 A134821 A134822
Sequence in context: A114409 A049063 A120894 this_sequence A135267 A118105 A125211
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KEYWORD
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nice,nonn,tabf
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AUTHOR
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David A. Consiglio, Jr. (davecons2002(AT)yahoo.com), Jan 28 2008, Apr 23 2008
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