Expansion of Product_{k>=1} (1 + x^k)^phi(k), where phi() is the Euler totient function (A000010).

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =4a(5) =8a(6) =11a(7) =19a(8) =30a(9) =44a(10) =69a(11) =103a(12) =157a(13) =229a(14) =341a(15) =491a(16) =722a(17) =1038a(18) =1488a(19) =2128a(20) =3015a(21) =4267a(22) =5989a(23) =8407a(24) =11713a(25) =16289a(26) =22523a(27) =31097a(28) =42729a(29) =58569