155325domain: NAppears in sequencesDivide natural numbers in groups with prime(n) elements and add together.at n=28A034957Partial sums of A014825, second partial sums of A002450.at n=8A052161Principal diagonal of the convolution array A213773.at n=29A214092Expansion of g.f.: x/((1-x^2)^3*(1-2*x)).at n=17A389373