Number of partially achiral planted trees with n nodes.

Terms

a(0) =0a(1) =0a(2) =1a(3) =1a(4) =2a(5) =3a(6) =6a(7) =10a(8) =19a(9) =33a(10) =62a(11) =110a(12) =204a(13) =366a(14) =677a(15) =1223a(16) =2254a(17) =4089a(18) =7526a(19) =13692a(20) =25171a(21) =45882a(22) =84291a(23) =153860a(24) =282509a(25) =516192a(26) =947469a(27) =1732477a(28) =3179083a(29) =5816301