445906944000
domain: N
Appears in sequences
- Products of the digits of e excluding 0.at n=19A084674
- Product of the digital sums of n for all the bases 2 to n (a 'digital-sum factorial').at n=19A131384
- a(n) is the order of the group of invertible elements in the semigroup M whose elements are the closed binary operations on an n-point set S and whose operation (on operations, in this case) is given by x AB y = (x B y) A (y B x) for operations A and B on S and points x and y in S.at n=4A242997