Number of ways the set {1,2,...,n} can be split into two subsets of which the sum of one is twice the sum of the other.

A113035

Number of ways the set {1,2,...,n} can be split into two subsets of which the sum of one is twice the sum of the other.

Terms

    a(0) =0a(1) =1a(2) =1a(3) =0a(4) =3a(5) =4a(6) =0a(7) =10a(8) =17a(9) =0a(10) =46a(11) =78a(12) =0a(13) =231a(14) =401a(15) =0a(16) =1233a(17) =2177a(18) =0a(19) =6869a(20) =12268a(21) =0a(22) =39502a(23) =71172a(24) =0a(25) =232686a(26) =422076a(27) =0a(28) =1396669a(29) =2547246

External references