Number of ways the set {1,2,...,n} can be split into three subsets X, Y, Z of equal sums, where the order of X, Y, Z matters.

A317577

Number of ways the set {1,2,...,n} can be split into three subsets X, Y, Z of equal sums, where the order of X, Y, Z matters.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =6a(5) =6a(6) =0a(7) =18a(8) =54a(9) =0a(10) =258a(11) =612a(12) =0a(13) =3570a(14) =8880a(15) =0a(16) =55764a(17) =142368a(18) =0a(19) =947946a(20) =2468844a(21) =0a(22) =17099808a(23) =45375498a(24) =0a(25) =323927184a(26) =871038570a(27) =0a(28) =6369199908a(29) =17312303760

External references