Expansion of e.g.f. log(1-log(1-x)).

Terms

a(0) =0a(1) =1a(2) =0a(3) =1a(4) =1a(5) =8a(6) =26a(7) =194a(8) =1142a(9) =9736a(10) =81384a(11) =823392a(12) =8738016a(13) =104336880a(14) =1328270880a(15) =18419317968a(16) =272291315376