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

Terms

a(0) =1a(1) =4a(2) =14a(3) =46a(4) =136a(5) =382a(6) =1022a(7) =2626a(8) =6530a(9) =15784a(10) =37218a(11) =85842a(12) =194146a(13) =431358a(14) =943038a(15) =2031454a(16) =4316884a(17) =9058662a(18) =18787730a(19) =38542526a(20) =78264298a(21) =157403290a(22) =313712482a(23) =619919350a(24) =1215125262a(25) =2363570168a(26) =4563951858a(27) =8751621598a(28) =16670498062a(29) =31553539214