Expansion of Product_{k>=1} 1/(1 - k^4*x^k).

Terms

a(0) =1a(1) =1a(2) =17a(3) =98a(4) =610a(5) =2531a(6) =18580a(7) =72453a(8) =449494a(9) =2114440a(10) =10753594a(11) =48572844a(12) =272867295a(13) =1137441506a(14) =5834448870a(15) =27276382027a(16) =129389072144a(17) =576677550870