A012842 - OEIS

%I #4 Feb 24 2012 12:51:10

%S 1,6,128,7000,757760,137329280,37511412352,14396574922496,

%T 7385535722319872,4879586077682790400,4034467892180241121280,

%U 4080124101723746610511872,4954185596977233058289319936

%N arcsin(sec(x)*arctanh(x))=x+6/3!*x^3+128/5!*x^5+7000/7!*x^7...

%K nonn

%O 0,2

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