289408

Appears in sequences

• arctanh(arcsinh(x)*cos(x))=x-2/3!*x^3-32/5!*x^5+152/7!*x^7+48448/9!*x^9...at n=5A012642
• E.g.f.: log(sec(x)+arcsinh(x)) = x-2/3!*x^3+12/4!*x^4-32/5!*x^5+72/6!*x^6...at n=11A013198
• a(n) = Sum_{k=1..n-1} sigma(k) * sigma_2(n-k).at n=36A374974