Sum of the sizes of all subsets of [n] whose sum is divisible by n.

Terms

a(0) =1a(1) =1a(2) =6a(3) =6a(4) =20a(5) =34a(6) =70a(7) =124a(8) =270a(9) =516a(10) =1034a(11) =2060a(12) =4108a(13) =8198a(14) =16440a(15) =32760a(16) =65552a(17) =131142a(18) =262162a(19) =524312a(20) =1048740a(21) =2097162a(22) =4194326a(23) =8388856a(24) =16777300a(25) =33554444a(26) =67109418a(27) =134217764a(28) =268435484a(29) =536872072