Number of nonempty subsets of {1,2,3,...,n} whose elements have an integer average.

Terms

a(0) =1a(1) =2a(2) =5a(3) =8a(4) =15a(5) =26a(6) =45a(7) =76a(8) =135a(9) =238a(10) =425a(11) =768a(12) =1399a(13) =2570a(14) =4761a(15) =8856a(16) =16567a(17) =31138a(18) =58733a(19) =111164a(20) =211043a(21) =401694a(22) =766417a(23) =1465488a(24) =2807671a(25) =5388782a(26) =10359849a(27) =19946832a(28) =38459623a(29) =74251094