Expansion of Sum_{k>=0} x^k * Product_{j=1..k} (1 + x^j)^j.

Terms

a(0) =1a(1) =1a(2) =2a(3) =2a(4) =4a(5) =6a(6) =10a(7) =14a(8) =24a(9) =37a(10) =56a(11) =90a(12) =135a(13) =204a(14) =316a(15) =474a(16) =704a(17) =1068a(18) =1579a(19) =2332a(20) =3445a(21) =5054a(22) =7376a(23) =10750a(24) =15587a(25) =22497a(26) =32437a(27) =46544a(28) =66520a(29) =94908