793945152000domain: NAppears in sequencesa(n) = denominator of b(n), where b(1)=1, b(n+1) = sum{k=1 to n} {b(n+1-k)/k} ({x} is the fractional part of x).at n=18A128192Denominator of the sum of inverse products of parts in all partitions of n.at n=18A322365