E.g.f.: exp(x + sinh(x)).

Terms

a(0) =1a(1) =2a(2) =4a(3) =9a(4) =24a(5) =73a(6) =246a(7) =913a(8) =3688a(9) =16057a(10) =74954a(11) =372749a(12) =1965156a(13) =10942285a(14) =64103006a(15) =393902353a(16) =2532010800a(17) =16982676561a(18) =118600412626a(19) =860680689429