Expansion of Product_{m>=1} (1+q^m)^(4*m).

Terms

a(0) =1a(1) =4a(2) =14a(3) =48a(4) =141a(5) =396a(6) =1058a(7) =2696a(8) =6646a(9) =15884a(10) =36956a(11) =83976a(12) =186849a(13) =407864a(14) =875030a(15) =1847824a(16) =3845520a(17) =7895872a(18) =16010610a(19) =32088120a(20) =63611656a(21) =124817444a(22) =242560418a(23) =467095640a(24) =891754784a(25) =1688619460