Series reversion of eta(-x) - 1.

Terms

a(0) =1a(1) =1a(2) =2a(3) =5a(4) =15a(5) =49a(6) =169a(7) =603a(8) =2205a(9) =8217a(10) =31095a(11) =119185a(12) =461790a(13) =1805810a(14) =7117865a(15) =28250549a(16) =112806534a(17) =452862663a(18) =1826705940a(19) =7399893522a(20) =30092189864a(21) =122799412699a(22) =502709227763