1860751domain: NAppears in sequencesNumber of ways to partition {1,2,...,n} into arithmetic progressions, where in each partition all the progressions have the same common difference and have lengths >= 2.at n=32A072255a(n) = [x^n] (1/(1 - x))*Product_{k>=1} (1 + n*x^k).at n=15A304782