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

Terms

a(0) =1a(1) =1a(2) =3a(3) =10a(4) =45a(5) =221a(6) =1315a(7) =8324a(8) =60809a(9) =464113a(10) =3993811a(11) =35342814a(12) =349085869a(13) =3486862653a(14) =38870528411a(15) =429139127416