Expansion of Product_{k>=1} 1/((1 - x^k) * (1 - x^(2*k)) * (1 - x^(3*k)) * (1 - x^(4*k))).

Terms

a(0) =1a(1) =1a(2) =3a(3) =5a(4) =11a(5) =16a(6) =32a(7) =47a(8) =84a(9) =124a(10) =205a(11) =298a(12) =477a(13) =681a(14) =1044a(15) =1484a(16) =2211a(17) =3097a(18) =4516a(19) =6261a(20) =8948a(21) =12295a(22) =17273a(23) =23511a(24) =32597a(25) =43975a(26) =60187a(27) =80601a(28) =109114a(29) =144999