-1826domain: ZAppears in sequencesMatrix logarithm of triangle A113287.at n=59A113290Riordan array (1/(1+2*x), x*(1+x)/(1+2*x)^2).at n=51A123876a(n) = Sum_{k=1..n} mu(k)*k^4.at n=6A336278a(n) = Sum_{k=1..n} mu(k)*k^4.at n=7A336278a(n) = Sum_{k=1..n} mu(k)*k^4.at n=8A336278