78132541528domain: NAppears in sequencesNumber of magic series of order n.at n=10A052456Number of 2*n-element subsets that can be chosen from {1,2,...,20*n} having element sum n*(20*n+1).at n=5A204466Number of 10-element subsets that can be chosen from {1,2,...,10*n} having element sum 50*n+5.at n=10A204474