Number of rooted identity trees with 2n+1 nodes.

Terms

a(0) =1a(1) =1a(2) =3a(3) =12a(4) =52a(5) =247a(6) =1226a(7) =6299a(8) =33209a(9) =178618a(10) =976296a(11) =5407384a(12) =30283120a(13) =171196956a(14) =975662480a(15) =5599508648a(16) =32334837886a(17) =187737500013