379438domain: NAppears in sequencesa(n) = Sum_{k=0..floor((n+1)/2)} (k+1) * A008315(n, k).at n=17A027305(Product of primes <= n) - 2^(n-1).at n=17A068511Let M(n) be the n X n matrix m(i,j)=min(i,j) for 1<=i,j<=n then a(n) is the trace of M(n)^(-9).at n=9A114361Row sums of A050157.at n=9A296771