G.f. A(x) satisfies A(x) = 1 / ((1 + x) * (1 - x * A(x^4))).

Terms

a(0) =1a(1) =0a(2) =1a(3) =0a(4) =1a(5) =0a(6) =1a(7) =0a(8) =1a(9) =1a(10) =2a(11) =2a(12) =3a(13) =3a(14) =4a(15) =4a(16) =5a(17) =6a(18) =8a(19) =10a(20) =13a(21) =16a(22) =20a(23) =24a(24) =29a(25) =35a(26) =43a(27) =53a(28) =66a(29) =82