159446

Appears in sequences

• E.g.f.: 1 + Sum_{n>=1} x^n/n! * Product_{k=1..n} (exp(k*x)-1)/(exp(x)-1).at n=7A196193
• Coefficient of x^n in the expansion of 1 / ( (1-x) * (1-2*x) )^n.at n=6A372506