Expansion of Sum_{k>=1} phi(k) * x^k/(1 - x^k)^4, where phi = Euler totient function (A000010).

Terms

a(0) =1a(1) =5a(2) =12a(3) =26a(4) =39a(5) =76a(6) =90a(7) =152a(8) =191a(9) =275a(10) =296a(11) =492a(12) =467a(13) =674a(14) =798a(15) =1000a(16) =985a(17) =1467a(18) =1348a(19) =1934a(20) =2011a(21) =2360a(22) =2322a(23) =3420a(24) =3085a(25) =3791a(26) =4062a(27) =4944a(28) =4523a(29) =6454