261395domain: NAppears in sequencesa(n) = (1/1 - 1/2 + ... + (-1)^(n-1)/n)*lcm{1..n}.at n=14A025530Numerator of the product of n and the n-th alternating harmonic number, Sum_{k=1..n} (-1)^(k+1)/k.at n=14A119787a(n) is the numerator of the n-th hyperharmonic number of order n.at n=7A354894