68719476016
domain: N
Appears in sequences
- a(n) = 2^(n^2) - n!.at n=5A344114
- Triangle read by rows: T(n,k) is the number of relations from an n-element set to a k-element set that are not one-to-one functions.at n=20A344115
- Triangle read by rows: T(n,k) is the number of relations from an n-element set to a k-element set that are not onto functions.at n=20A344116