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Search: id:A047788
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| A047788 |
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Numerators of Glaisher's I-numbers. |
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+0
5
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| 1, 1, 1, 7, 809, 1847, 55601, 6921461, 126235201, 8806171927, 2288629046003, 80348736972167, 10111159088668001, 40453941942593304589, 258227002122139705201, 51215766794507248883047, 34747165199239302488636803, 2962605017328303351107945687
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OFFSET
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0,4
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REFERENCES
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J. W. L. Glaisher, On a set of coefficients analogous to the Eulerian numbers, Proc. London Math. Soc., 31 (1899), 216-235.
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LINKS
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Index entries for sequences related to Glaisher's numbers
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FORMULA
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E.g.f. for (-1)^n*I(n) is (3/2)/(1+exp(x)+exp(-x)).
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EXAMPLE
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1/2, 1/3, 1, 7, 809/9, 1847, 55601, 6921461/3,...
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PROGRAM
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(PARI) a(n)=if(n<1, (n==0), n*=2; numerator(n!*polcoeff(3/(2+4*cos(x+O(x^n))), n))) - Michael Somos Feb 26 2004
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CROSSREFS
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Cf. A047789, A002111.
Sequence in context: A020470 A014013 A001467 this_sequence A087350 A093171 A127102
Adjacent sequences: A047785 A047786 A047787 this_sequence A047789 A047790 A047791
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KEYWORD
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nonn,frac
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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