E.g.f.: exp(-exp(-x)+1+x).

Terms

a(0) =1a(1) =2a(2) =3a(3) =3a(4) =2a(5) =3a(6) =5a(7) =-4a(8) =5a(9) =55a(10) =-212a(11) =201a(12) =2381a(13) =-15350a(14) =35183a(15) =145359a(16) =-1821438a(17) =8117231a(18) =-521487a(19) =-278996548a(20) =2261959961a(21) =-7554900397a(22) =-34727188796a(23) =690775844605