-4024

Appears in sequences

• sech(arcsin(x)+sin(x))=1-4/2!*x^2+80/4!*x^4-4024/6!*x^6+373376/8!*x^8...at n=3A012923
• G.f. A(x) satisfies: A(x) = A(x^3 - x^5)/x^2.at n=31A350479