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A104007 Denominators of coefficients in expansion of x^2*(1-exp(-2*x))^(-2). 2
4, 2, 12, 6, 60, 90, 378, 945, 2700, 9450, 20790, 93555, 116093250, 638512875, 1403325, 18243225, 43418875500, 325641566250, 4585799468250, 38979295480125, 161192575293750, 1531329465290625, 640374140030625, 13447856940643125, 17558223649022306250 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..24.

MATHEMATICA

Denominator[ CoefficientList[ Series[x^2*(1 - E^(-2x))^(-2), {x, 0, 33}], x]] (from Robert G. Wilson v, Apr 20 2005)

CROSSREFS

See A098087 for further information.

Sequence in context: A191436 A243344 A201825 * A191441 A152664 A167591

Adjacent sequences:  A104004 A104005 A104006 * A104008 A104009 A104010

KEYWORD

nonn,frac

AUTHOR

N. J. A. Sloane, Apr 17 2005

STATUS

approved

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Last modified December 18 07:26 EST 2014. Contains 252098 sequences.