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

Terms

a(0) =1a(1) =1a(2) =6a(3) =15a(4) =45a(5) =105a(6) =302a(7) =668a(8) =1664a(9) =3830a(10) =8793a(11) =19350a(12) =43265a(13) =92552a(14) =198418a(15) =418128a(16) =869999a(17) =1787964a(18) =3651028a(19) =7353349a(20) =14697367a(21) =29139447a(22) =57225893a(23) =111572329a(24) =216001937a(25) =415000057a(26) =792008753a(27) =1502559866a(28) =2831393559a(29) =5305614223