G.f. is g.f. for A059271 divided by g.f. for A059227.

Terms

a(0) =0a(1) =1a(2) =2a(3) =9a(4) =47a(5) =272a(6) =1685a(7) =10939a(8) =73462a(9) =506111a(10) =3557109a(11) =25404296a(12) =183834627a(13) =1344987117a(14) =9932411282a(15) =73937697965a(16) =554234827675