a(n) is the number of multisets S of positive integers satisfying E(S)=n, where E = 2nd elementary symmetric function.

A026903

a(n) is the number of multisets S of positive integers satisfying E(S)=n, where E = 2nd elementary symmetric function.

Terms

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

External references