100989

Appears in sequences

• Number of ordered quadruples of integers from [ 2,n ] with no global factor.at n=38A015638
• Numbers k such that k and 9*k are anagrams.at n=11A023093
• a(n) = Sum(((k-1)/2)*k!*Stirling_2(n,k),k=1..n).at n=6A083411
• Matrix product of Stirling2-triangle A008277(n,k) and unsigned Lah-triangle |A008297(n,k)|.at n=22A088729
• Exponential Riordan array [1, 1/(2-e^x)-1].at n=30A256893