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A047789
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Denominators of Glaisher's I-numbers.
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4
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2, 3, 1, 1, 9, 1, 1, 3, 1, 1, 3, 1, 1, 27, 1, 1, 3, 1, 1, 3, 1, 1, 9, 1, 1, 3, 1, 1, 3, 1, 1, 9, 1, 1, 3, 1, 1, 3, 1, 1, 81, 1, 1, 3, 1, 1, 3, 1, 1, 9, 1, 1, 3, 1, 1, 3, 1, 1, 9, 1, 1, 3, 1, 1, 3, 1, 1, 27, 1, 1, 3, 1, 1, 3, 1, 1, 9, 1, 1, 3, 1, 1, 3, 1, 1, 9, 1, 1, 3, 1, 1, 3, 1, 1, 27, 1, 1, 3, 1, 1, 3, 1
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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REFERENCES
| 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
| Index entries for sequences related to Glaisher's numbers
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EXAMPLE
| 1/2, 1/3, 1, 7, 809/9, 1847, 55601, 6921461/3,...
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PROG
| (PARI) a(n)=if(n<1, 2*(n==0), 3^valuation(2*n+1, 3)) - Michael Somos Feb 26 2004
(PARI) a(n)=if(n<1, 2*(n==0), n*=2; denominator(n!*polcoeff(3/(2+4*cos(x+O(x^n))), n))) - Michael Somos Feb 26 2004
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CROSSREFS
| Cf. A047788, A002111.
Sequence in context: A204167 A135900 A173272 * A068869 A064529 A091654
Adjacent sequences: A047786 A047787 A047788 * A047790 A047791 A047792
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KEYWORD
| nonn,frac
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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