A013067 - OEIS

%I #4 Feb 24 2012 12:51:18

%S 1,-4,88,-5014,538376,-93064954,23605179172,-8256285769398,

%T 3808207305952112,-2239609649656903474,1635640402649689743132,

%U -1452319030188781207688526,1540754005662731974429453160

%N sech(sinh(x)+arctan(x))=1-4/2!*x^2+88/4!*x^4-5014/6!*x^6...

%K sign

%O 0,2

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