Number of ways to break {1,2,3,...,n} into sets with equal sums.

Terms

a(0) =1a(1) =1a(2) =2a(3) =2a(4) =2a(5) =2a(6) =6a(7) =12a(8) =11a(9) =2a(10) =80a(11) =166a(12) =2a(13) =665a(14) =2918a(15) =3309a(16) =9296a(17) =23730a(18) =31875a(19) =301030a(20) =422897a(21) =2a(22) =13716867a(23) =71504980a(24) =100664385a(25) =54148591a(26) =880696662a(27) =498017759a(28) =27450476787a(29) =111911522819