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

Terms

a(0) =1a(1) =2a(2) =8a(3) =24a(4) =66a(5) =176a(6) =448a(7) =1096a(8) =2608a(9) =6042a(10) =13664a(11) =30280a(12) =65856a(13) =140800a(14) =296432a(15) =615264a(16) =1260306a(17) =2550368a(18) =5102616a(19) =10101000a(20) =19797344a(21) =38439088a(22) =73976160a(23) =141179480a(24) =267300752a(25) =502283714a(26) =937077808a(27) =1736296304a(28) =3196144032a(29) =5846632656