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

Terms

a(0) =1a(1) =2a(2) =3a(3) =10a(4) =13a(5) =28a(6) =58a(7) =90a(8) =146a(9) =260a(10) =481a(11) =688a(12) =1168a(13) =1748a(14) =2863a(15) =4726a(16) =6938a(17) =10412a(18) =16140a(19) =23746a(20) =35702a(21) =55812a(22) =79032a(23) =116758a(24) =168779a(25) =247006a(26) =350310a(27) =513410a(28) =744286a(29) =1045466