Number of trees with stability index n.

Terms

a(0) =5a(1) =7a(2) =15a(3) =27a(4) =57a(5) =114a(6) =243a(7) =506a(8) =1102a(9) =2381a(10) =5269a(11) =11686a(12) =26277a(13) =59348a(14) =135317a(15) =310064a(16) =715475a(17) =1659321a(18) =3870414a(19) =9071915a(20) =21372782a(21) =50591199a(22) =120332237