-9199

Appears in sequences

• sech(arcsin(arctanh(x)))=1-1/2!*x^2-7/4!*x^4-169/6!*x^6-9199/8!*x^8...at n=4A012145
• Expansion of (1-x)/(1+2*x^2-x^3).at n=24A078035