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arctanh(sec(x)-sech(x))=2/2!*x^2+362/6!*x^6+1441682/10!*x^10...
0

%I #6 Mar 30 2012 17:26:41

%S 2,362,1441682,32555086202,2447023018597922,462534850269339720842,

%T 184789477601927787169878962,138612178386831070025588251376282,

%U 179134512141830902349787461672276596802

%N arctanh(sec(x)-sech(x))=2/2!*x^2+362/6!*x^6+1441682/10!*x^10...

%K nonn

%O 0,1

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

%E More terms from _Max Alekseyev_, Feb 06 2010