Total number of subsets of the n-th roots of 1 that add to zero.

Terms

a(0) =1a(1) =1a(2) =2a(3) =2a(4) =4a(5) =2a(6) =10a(7) =2a(8) =16a(9) =8a(10) =34a(11) =2a(12) =100a(13) =2a(14) =130a(15) =38a(16) =256a(17) =2a(18) =1000a(19) =2a(20) =1156a(21) =134a(22) =2050a(23) =2a(24) =10000a(25) =32a(26) =8194a(27) =512a(28) =16900a(29) =2