Expansion of series_reversion( x/(1+x^4*sum(k>=0, x^k)) ) / x.

Terms

a(0) =1a(1) =0a(2) =0a(3) =0a(4) =1a(5) =1a(6) =1a(7) =1a(8) =5a(9) =10a(10) =16a(11) =23a(12) =53a(13) =118a(14) =232a(15) =411a(16) =813a(17) =1718a(18) =3568a(19) =7012a(20) =13925a(21) =28603a(22) =59533a(23) =121878a(24) =247915a(25) =509136a(26) =1057278a(27) =2194138a(28) =4536943a(29) =9394145