Number of subsets A of {1,2,...,n} with |A+A| = |A-A|.

Terms

a(0) =2a(1) =4a(2) =8a(3) =14a(4) =24a(5) =40a(6) =66a(7) =106a(8) =174a(9) =286a(10) =480a(11) =814a(12) =1412a(13) =2480a(14) =4476a(15) =8184a(16) =15230a(17) =28652a(18) =54488a(19) =104262a(20) =201266a(21) =390090a(22) =760234a(23) =1486030a(24) =2914492a(25) =5728506a(26) =11289420a(27) =22279222a(28) =44046072a(29) =87181188