Number of distinct variances of nonempty subsets of {1, ..., n}.

Terms

a(0) =0a(1) =1a(2) =2a(3) =4a(4) =7a(5) =13a(6) =23a(7) =40a(8) =68a(9) =124a(10) =208a(11) =368a(12) =559a(13) =918a(14) =1352a(15) =2017a(16) =2891a(17) =4122a(18) =5506a(19) =7458a(20) =9623a(21) =12620a(22) =16125a(23) =20626a(24) =25401a(25) =31513a(26) =38587a(27) =47244a(28) =56592a(29) =68021