42358domain: NAppears in sequencesEngel expansion of zeta(8)=sum(i>0,1/i^8).at n=8A067916Number of compositions of n with exactly two descents.at n=12A241627a(n) = Sum_{i=1..n} sigma(i)*sigma(i+1), where sigma(n) = A000203(n) is the sum of the divisors of n.at n=35A330322