Numerator of coefficients of power series for exp(exp(x)-1).

Terms

a(0) =1a(1) =1a(2) =1a(3) =5a(4) =5a(5) =13a(6) =203a(7) =877a(8) =23a(9) =1007a(10) =4639a(11) =22619a(12) =4213597a(13) =27644437a(14) =95449661a(15) =276591709a(16) =10480142147a(17) =255755771a(18) =97439543737a(20) =263898766507