1545075

Appears in sequences

• exp(arcsinh(x)-log(x+1)) = 1+1/2!*x^2-3/3!*x^3+9/4!*x^4-45/5!*x^5...at n=10A013492
• a(n) = Sum_{1<=k<=n, gcd(n,k)=1} (-1)^(n-k)*Stirling1(n,k).at n=9A096314
• a(n) = (2*n-1)!! mod n!, where double factorial is A006882.at n=9A232701