Number of difference sets of subsets of {1,2,...,n}, i.e., the size of {D(A) : A subset [n] }, where D(A)={a_i-a_j : a_i>a_j and a_i,a_j in A}.

A067247

Number of difference sets of subsets of {1,2,...,n}, i.e., the size of {D(A) : A subset [n] }, where D(A)={a_i-a_j : a_i>a_j and a_i,a_j in A}.

Terms

    a(0) =1a(1) =2a(2) =4a(3) =6a(4) =10a(5) =16a(6) =25a(7) =39a(8) =63a(9) =99a(10) =158a(11) =253a(12) =402a(13) =639a(14) =1021a(15) =1633a(16) =2617a(17) =4153a(18) =6633a(19) =10460a(20) =16598a(21) =26146a(22) =41409a(23) =64733a(24) =102006a(25) =159165a(26) =249698a(27) =387515a(28) =604769a(29) =933531

External references