Expansion of e.g.f. exp(1 - exp(x)*(1 - 2*x)).

Terms

a(0) =1a(1) =1a(2) =4a(3) =15a(4) =73a(5) =410a(6) =2591a(7) =18165a(8) =139266a(9) =1155509a(10) =10293729a(11) =97815520a(12) =986113613a(13) =10499247005a(14) =117603042220