-1827

Appears in sequences

• Expansion of e.g.f.: arctan(cosh(x)*log(x+1))=x-1/2!*x^2+3/3!*x^3-57/5!*x^5+405/6!*x^6...at n=7A012759
• Expansion of Product_{m>=1} (1+q^m)^(-9).at n=7A022604
• Row sums of triangle A132898.at n=41A132899
• a(n) = Sum_{d|n} (-1)^(n/d+1) * d^(n-d).at n=11A342828