Number of sets S of positive integers satisfying E(S)=n, where E = 2nd elementary symmetric function.

A026904

Number of sets S of positive integers satisfying E(S)=n, where E = 2nd elementary symmetric function.

Terms

    a(0) =0a(1) =1a(2) =1a(3) =1a(4) =1a(5) =2a(6) =1a(7) =2a(8) =1a(9) =2a(10) =2a(11) =3a(12) =1a(13) =3a(14) =2a(15) =2a(16) =2a(17) =3a(18) =2a(19) =4a(20) =2a(21) =2a(22) =3a(23) =4a(24) =1a(25) =4a(26) =3a(27) =3a(28) =3a(29) =4

External references