A012923 - OEIS

A012923

sech(arcsin(x)+sin(x))=1-4/2!*x^2+80/4!*x^4-4024/6!*x^6+373376/8!*x^8...

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

%S 1,-4,80,-4024,373376,-55810464,12218736768,-3690395100032,

%T 1469402675519488,-746064489482211840,470375829415840688128,

%U -360567791801354924107776,330231250494338680414994432

%N sech(arcsin(x)+sin(x))=1-4/2!*x^2+80/4!*x^4-4024/6!*x^6+373376/8!*x^8...

%K sign

%O 0,2

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