# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/

Search: id:a012756
Showing 1-1 of 1

%I A012756 #8 Feb 08 2015 07:34:54
%S A012756 1,2,28,968,61584,6221472,912779712,183144253056,48126940270848,
%T A012756 16031131073204736,6598147635721116672,3287285755024478177280,
%U A012756 1949289186179973455646720,1356446896562442205265633280
%N A012756 exp(arctanh(x)*arctanh(x))=1+2/2!*x^2+28/4!*x^4+968/6!*x^6+61584/8!*x^8...
%H A012756 Vaclav Kotesovec, <a href="/A012756/b012756.txt">Table of n, a(n) for n = 0..223</a>
%t A012756 nn = 20; Table[(CoefficientList[Series[E^(ArcTanh[x]^2), {x, 0, 2*nn}], x] * Range[0, 2*nn]!)[[n]], {n, 1, 2*nn+1, 2}] (* _Vaclav Kotesovec_, Feb 08 2015 *)
%K A012756 nonn
%O A012756 0,2
%A A012756 Patrick Demichel (patrick.demichel(AT)hp.com)

# Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE