Number of binary vectors (x_1,...x_(n-1)) satisfying Sum_{i=1..n-1} (-1)^i*i*x_i = 0 (mod n).

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =6a(5) =9a(6) =16a(7) =28a(8) =52a(9) =93a(10) =172a(11) =315a(12) =586a(13) =1091a(14) =2048a(15) =3855a(16) =7286a(17) =13797a(18) =26216a(19) =49929a(20) =95326a(21) =182361a(22) =349536a(23) =671088a(24) =1290556a(25) =2485504a(26) =4793492a(27) =9256395a(28) =17895736a(29) =34636833