20246445

Appears in sequences

• a(n) = Sum(((k-1)/2)*k!*Stirling_2(n,k),k=1..n).at n=8A083411
• Matrix product of Stirling2-triangle A008277(n,k) and unsigned Lah-triangle |A008297(n,k)|.at n=37A088729
• Exponential Riordan array [1, 1/(2-e^x)-1].at n=47A256893