a(n) = number of nonempty subsets of {1,2,...,n} having a partition into two subsets with the same sum of elements.

A357212

a(n) = number of nonempty subsets of {1,2,...,n} having a partition into two subsets with the same sum of elements.

Terms

    a(0) =0a(1) =0a(2) =1a(3) =3a(4) =7a(5) =17a(6) =37a(7) =81a(8) =174a(9) =372a(10) =786a(11) =1650a(12) =3438a(13) =7125a(14) =14666a(15) =30048a(16) =61248a(17) =124439a(18) =251921a(19) =508778a(20) =1025182a(21) =2062286a(22) =4142643a(23) =8312926a(24) =16667004a(25) =33395274

External references