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Search: id:A120420
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| A120420 |
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Number of graphs of functions with n triple points. |
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+0
2
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| 1, 2, 19, 428, 17746, 1178792, 114892114, 15465685088, 2750970320776, 625218940868432, 176816078759177584, 60910324282361987648, 25113805147553980835056, 12212353714587611449244672
(list; graph; listen)
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OFFSET
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1,2
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REFERENCES
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V. I. Arnold, Smooth function statistics, Funct. Anal. Other. Math., 1 (2006), 111-118.
Liviu I. Nicolaescu, Counting Morse functions on the 2-sphere, arXiv:math/0512496.
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LINKS
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Vladeta Jovovic (vladeta(AT)eunet.rs), Feb 22 2008, Table of n, a(n) for n = 1..21
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FORMULA
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Nicolaescu gives a g.f.
a(n) >= A135487(n).
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CROSSREFS
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Sequence in context: A090308 A110818 A155927 this_sequence A158099 A015204 A086976
Adjacent sequences: A120417 A120418 A120419 this_sequence A120421 A120422 A120423
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Feb 21 2008
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EXTENSIONS
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More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Feb 22 2008
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