A problem in parity.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =3a(5) =1a(6) =1a(7) =4a(8) =5a(9) =1a(10) =3a(11) =1a(12) =3a(13) =1a(14) =1a(15) =8a(16) =15a(17) =3a(18) =7a(19) =4a(20) =5a(21) =2a(22) =3a(23) =3a(24) =6a(25) =2a(26) =3a(27) =2a(28) =3a(29) =1