Number of certain rooted planar maps.

Terms

a(0) =1a(1) =6a(2) =26a(3) =120a(4) =594a(5) =3094a(6) =16728a(7) =93024a(8) =528770a(9) =3058770a(10) =17948970a(11) =106585440a(12) =639318456a(13) =3867821640a(14) =23574446992a(15) =144621823632a(16) =892293152994