Number of certain rooted planar maps.

Terms

a(0) =1a(1) =3a(2) =13a(3) =63a(4) =326a(5) =1761a(6) =9808a(7) =55895a(8) =324301a(9) =1908878a(10) =11369744a(11) =68395917a(12) =414927215a(13) =2535523154a(14) =15592255913a(15) =96419104103a(16) =599176447614