E.g.f.: exp( (x * exp(x) + sinh(x)) / 2 ).

Terms

a(0) =1a(1) =1a(2) =2a(3) =6a(4) =20a(5) =79a(6) =357a(7) =1783a(8) =9788a(9) =58361a(10) =374581a(11) =2571851a(12) =18779928a(13) =145163975a(14) =1183028095a(15) =10129297307a(16) =90843458256a(17) =851083079649