-652487680

Appears in sequences

• Expansion of log(1+sin(x)*cos(x)).at n=13A009338
• arctanh(cos(x)*sin(x))=x-2/3!*x^3-40/5!*x^5+208/7!*x^7+64640/9!*x^9...at n=6A012477
• Expansion of e.g.f. log(sec(x) + sin(x)).at n=13A013194