82864869803
domain: N
Appears in sequences
- a(n) = B(n) - 1, where B(n) = Bell numbers, A000110.at n=15A058692
- Number of primitive (aperiodic) word structures of length n using an infinite alphabet.at n=17A082951
- Number of arrays of n 0..15 integers with new values introduced in order 0..15 but otherwise unconstrained.at n=16A203646
- a(n) = Sum_{k=1..n, gcd(n,k) = 1} Stirling2(n,k).at n=16A308463
- Number of set partitions of {1,...,n} with relatively prime block sizes.at n=17A318120
- a(n) = n! * [x^n] exp(Sum_{k=1..n, gcd(n,k) = 1} x^k / k!).at n=17A335797