%I A101928
%S A101928 1,1,5,85,3145,204425,20646925,2993804125,589779412625,151573309044625,
%T A101928 49261325439503125,19753791501240753125,9580588878101765265625,
%U A101928 5527999782664718558265625
%V A101928 1,-1,5,-85,3145,-204425,20646925,-2993804125,589779412625,-151573309044625,
%W A101928 49261325439503125,-19753791501240753125,9580588878101765265625,
%X A101928 -5527999782664718558265625
%N A101928 Expansion of cos(asinh(x)) = sin(acosh(x)).
%C A101928 Absolute values are expansion of cosh(asin(x)).
%e A101928 cos(asinh(x)) = 1 - x^2/2 + 5x^4/4! - 85x^6/6! + 3145x^8/8! -...
%Y A101928 Bisection of A006228.
%Y A101928 Sequence in context: A121290 A012743 A139744 this_sequence A012788 A012815 
               A113107
%Y A101928 Adjacent sequences: A101925 A101926 A101927 this_sequence A101929 A101930 
               A101931
%K A101928 sign
%O A101928 1,3
%A A101928 Ralf Stephan, Dec 28 2004