%I A143581
%S A143581 2,1,3,5,35,63,231,143,6435,12155,46189,88179,676039,1300075,5014575,
%T A143581 9694845,100180065,116680311,2268783825,1472719325,34461632205,
%U A143581 67282234305,17534158031,514589420475,8061900920775,5267108601573
%N A143581 Numerators of coefficient of x^(n+1/2) in the series expansion of the 
               haversine.
%H A143581 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               InverseHaversine.html">Inverse Haversine</a>
%e A143581 2*Sqrt[z] + z^(3/2)/3 + (3*z^(5/2))/20 + (5*z^(7/2))/56 + (35*z^(9/2))/
               576 + ...
%Y A143581 Cf. A143582.
%Y A143581 Cf. A055786. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 05 
               2008]
%Y A143581 Sequence in context: A049902 A096631 A144057 this_sequence A096871 A077890 
               A077877
%Y A143581 Adjacent sequences: A143578 A143579 A143580 this_sequence A143582 A143583 
               A143584
%K A143581 nonn,frac
%O A143581 1,1
%A A143581 E. W. Weisstein (eric(AT)weisstein.com), Aug 24, 2008