Number of plane trees with n edges and having an odd number of leaves.

Terms

a(0) =1a(1) =1a(2) =2a(3) =7a(4) =22a(5) =66a(6) =212a(7) =715a(8) =2438a(9) =8398a(10) =29372a(11) =104006a(12) =371516a(13) =1337220a(14) =4847208a(15) =17678835a(16) =64823110a(17) =238819350a(18) =883629164a(19) =3282060210a(20) =12233141908a(21) =45741281820a(22) =171529777432a(23) =644952073662