115985

Appears in sequences

• Dirichlet convolution of phi(n) with Bell numbers.at n=10A034767
• Kochański's (or Kochanski's) sequence.at n=7A191642
• Rank of the inverse semigroup D_n of all difunctional relations on an n-element set.at n=10A294431
• Triangle read by rows: T(n,k) (0 <= k <= n) is the rank of the ideal I_r in the inverse semigroup D_n of all difunctional relations on an n-element set.at n=65A294432