a(n) = [x^n] Product_{k=1..n} (x^(k^4) + 1/x^(k^4)).

Terms

a(0) =1a(1) =1a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =0a(8) =0a(9) =0a(10) =0a(11) =0a(12) =0a(13) =0a(14) =0a(15) =0a(16) =0a(17) =0a(18) =0a(19) =0a(20) =0a(21) =6a(22) =0a(23) =0a(24) =8a(25) =13a(26) =0a(27) =0a(28) =272a(29) =0