Expansion of Product_{k>=1} (1 + k*x^k)^(k^2).

Terms

a(0) =1a(1) =1a(2) =8a(3) =35a(4) =115a(5) =429a(6) =1425a(7) =4803a(8) =15398a(9) =48940a(10) =151046a(11) =459000a(12) =1373219a(13) =4037721a(14) =11723911a(15) =33566828a(16) =94993571a(17) =265722551a(18) =735543433a(19) =2015558930a(20) =5471271099a(21) =14719853084a(22) =39266487114a(23) =103908002173a(24) =272855152096a(25) =711272144097