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

Terms

a(0) =1a(1) =1a(2) =4a(3) =7a(4) =18a(5) =32a(6) =72a(7) =127a(8) =257a(9) =454a(10) =861a(11) =1497a(12) =2719a(13) =4654a(14) =8171a(15) =13781a(16) =23564a(17) =39159a(18) =65559a(19) =107455a(20) =176712a(21) =286000a(22) =463200a(23) =740910a(24) =1184123a(25) =1873656a(26) =2959376a(27) =4636145a(28) =7245680a(29) =11246590