G.f.: (1+x^4)/(1-x-x^8).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =2a(6) =2a(7) =2a(8) =3a(9) =4a(10) =5a(11) =6a(12) =8a(13) =10a(14) =12a(15) =14a(16) =17a(17) =21a(18) =26a(19) =32a(20) =40a(21) =50a(22) =62a(23) =76a(24) =93a(25) =114a(26) =140a(27) =172a(28) =212a(29) =262