-7013

Appears in sequences

• arctan(sin(tanh(x)))=x-5/3!*x^3+121/5!*x^5-7013/7!*x^7+752785/9!*x^9...at n=3A012046
• a(n) = Sum_{k=1..n} (-1)^(k-1) * binomial(k+2,3) * floor(n/k).at n=45A366938