16830250920domain: NAppears in sequencesExpansion of 1/(1-4*x)^(7/2).at n=13A020918a(n) = 70*(n+1)*binomial(2*n+1,n+1)/(n+5).at n=15A246507Least k such that Sum_{i=1..n} (-k)^i / i is a positive integer.at n=32A333073Least k such that Sum_{i=1..n} (-k)^i / i is a positive integer.at n=33A333073