191700

Appears in sequences

• a(n) = the number of "isolated divisors" of n!. A positive divisor, k, of n is isolated if neither (k-1) nor (k+1) divides n.at n=22A133952
• The Wiener index of a link of n fullerenes C_{20} (see the Ghorbani and Hosseinzadeh reference).at n=8A216114
• Number of lonely (gene tree, species tree) pairs with n+1 leaves.at n=4A306205
• Discriminants of totally real cubic fields with 2 associated nonconjugate fields.at n=38A329786
• a(n) = n!^2 * [x^n] polylog(2,x)^3.at n=6A370225