-3190domain: ZAppears in sequencesExpansion of Product_{k>=1} (1-x^k)^30.at n=3A010835Expansion of Product_{m>=1} (1 - m*q^m)^5.at n=13A022665a(n) = -(n - 4)*(n - 5)*(n - 12)/6.at n=28A167541Partial alternating sums of the sigma_2 function: a(n) = Sum_{k=1..n} (-1)^(k+1) * sigma_2(k).at n=42A379921