Expansion of Product_{k>=0} 1/(1-x^(4*k+1))^4.

Terms

a(0) =1a(1) =4a(2) =10a(3) =20a(4) =35a(5) =60a(6) =100a(7) =160a(8) =245a(9) =364a(10) =536a(11) =780a(12) =1115a(13) =1564a(14) =2166a(15) =2980a(16) =4065a(17) =5484a(18) =7326a(19) =9720a(20) =12830a(21) =16824a(22) =21902a(23) =28344a(24) =36510a(25) =46820a(26) =59736a(27) =75844a(28) =95910a(29) =120844