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

Terms

a(0) =1a(1) =1a(2) =3a(3) =10a(4) =30a(5) =87a(6) =249a(7) =705a(8) =1974a(9) =5471a(10) =15032a(11) =40997a(12) =111079a(13) =299151a(14) =801139a(15) =2134251a(16) =5657895a(17) =14930596a(18) =39232009a(19) =102673794a(20) =267692321a(21) =695440442a(22) =1800582809a(23) =4646964755a(24) =11956293758a(25) =30673060344a(26) =78470890246a(27) =200218512582a(28) =509557661691