A012139 - OEIS

%I #4 Feb 24 2012 12:50:41

%S 1,4,84,4208,386064,56523072,12121690944,3589856932608,

%T 1406019035808000,704535958463063040,439949357001315947520,

%U 335139715537167259791360,305989012726577998256148480

%N sinh(arcsin(arctanh(x)))=x+4/3!*x^3+84/5!*x^5+4208/7!*x^7+386064/9!*x^9...

%K nonn

%O 0,2

%A Patrick Demichel (patrick.demichel(AT)hp.com)