%I A009445
%S A009445 1,6,120,5040,362880,39916800,6227020800,1307674368000,355687428096000,
%T A009445 121645100408832000,51090942171709440000,25852016738884976640000,15511210043330985984000000,
%U A009445 10888869450418352160768000000,8841761993739701954543616000000,8222838654177922817725562880000000
%N A009445 (2n+1)!.
%C A009445 Denominators in the expansion of sin(x): sin(x) = x - x^3/3! + x^5/5! 
               - x^7/7! + ...
%D A009445 W. Dunham, Touring the calculus gallery, Amer. Math. Monthly, 112 (2005), 
               1-19.
%D A009445 I. Newton, De analysi, 1669; reprinted in D. Whiteside, ed., The Mathematical 
               Works of Isaac Newton, vol. 1, Johnson Reprint Co., 1964; see p. 
               20.
%D A009445 H. B. Dwight, Tables of Integrals and Other Mathematical Data, Macmillan, 
               NY, 1968, p. 88.
%H A009445 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               HyperbolicSine.html">Hyperbolic Sine</a>
%o A009445 sage: [stirling_number1(2*i,1) for i in xrange(1,22)] - Zerinvary Lajos 
               (zerinvarylajos(AT)yahoo.com), Jun 27 2008
%Y A009445 Cf. A010050, A000142.
%Y A009445 Sequence in context: A057003 A096718 A096720 this_sequence A094273 A094278 
               A093910
%Y A009445 Adjacent sequences: A009442 A009443 A009444 this_sequence A009446 A009447 
               A009448
%K A009445 nonn,easy
%O A009445 0,2
%A A009445 R. H. Hardin (rhhardin(AT)att.net), Joe Keane (jgk(AT)jgk.org)