a(n) = [x^(n^3)] Product_{k=1..n} (x^(k^3) + 1 + 1/x^(k^3)).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =2a(7) =3a(8) =4a(9) =11a(10) =24a(11) =46a(12) =106a(13) =238a(14) =537a(15) =1318a(16) =3007a(17) =7027a(18) =18199a(19) =43202a(20) =105900a(21) =279860a(22) =688474a(23) =1741235a(24) =4641670a(25) =11790546a(26) =30529486a(27) =82306963a(28) =213852619a(29) =563866091