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Denominators of coefficients in expansion of x^-2*(1-exp(-2*x))^2.
3

%I #6 Aug 12 2019 16:36:22

%S 1,1,3,1,45,5,315,189,2025,4725,467775,1485,42567525,212837625,

%T 91216125,42567525,97692469875,516891375,9280784638125,236238154425,

%U 43752270436875,714620417135625,147926426347074375,53123043290625,48076088562799171875

%N Denominators of coefficients in expansion of x^-2*(1-exp(-2*x))^2.

%H Robert Israel, <a href="/A104097/b104097.txt">Table of n, a(n) for n = 0..504</a>

%p S:= series(x^(-2)*(1-exp(-2*x))^2, x, 32):

%p seq(denom(coeff(S, x, j)), j=0..31); # Robert Israel, Aug 12 2019

%Y See A104042 for more information.

%K nonn,frac

%O 0,3

%A _N. J. A. Sloane_, Apr 18 2005