862440068domain: NAppears in sequencesExpansion of e.g.f. (2 - e^x)^(-2).at n=10A005649a(n) is the number of ordered partitions of {1,1,2,3,...,n-1}.at n=10A172109Number of achiral loops (necklaces or bracelets) of length n with integer entries that cover an initial interval of positive integers.at n=20A327868