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Search: id:A060311
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| A060311 |
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E.g.f.: exp((exp(x)-1)^2/2). |
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1
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| 1, 0, 1, 3, 10, 45, 241, 1428, 9325, 67035, 524926, 4429953, 40010785, 384853560, 3925008361, 42270555603, 478998800290, 5693742545445, 70804642315921, 918928774274028, 12419848913448565, 174467677050577515
(list; graph; listen)
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OFFSET
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0,4
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COMMENT
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After the first term, this is the Stirling transform of the sequence of moments of the standard normal (or "Gaussian") probability distribution. It is not itself a moment sequence of any probability distribution. - Michael Hardy (hardy(AT)math.umn.edu), May 29 2005
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REFERENCES
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I. P. Goulden and D. M. Jackson, Combinatorial Enumeration, John Wiley and Sons, N.Y., 1983.
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FORMULA
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E.g.f. A(x) = B(exp(x)-1) where B(x)=exp(x^2/2) is e.g.f. of A001147(2n), hence a(n) is the Stirling transform of A001147(2n). - Michael Somos Jun 01 2005
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PROGRAM
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(PARI) a(n)=if(n<0, 0, n!*polcoeff( exp((exp(x+x*O(x^n))-1)^2/2), n)) /* Michael Somos Jun 01 2005 */
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CROSSREFS
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Sequence in context: A096752 A134018 A028417 this_sequence A099237 A006220 A020026
Adjacent sequences: A060308 A060309 A060310 this_sequence A060312 A060313 A060314
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KEYWORD
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nonn
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AUTHOR
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Vladeta Jovovic (vladeta(AT)Eunet.yu), Mar 27 2001
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