Number of trees by stability index.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =2a(7) =3a(8) =5a(9) =12a(10) =22a(11) =47a(12) =94a(13) =201a(14) =417a(15) =907a(16) =1948a(17) =4289a(18) =9440a(19) =21063a(20) =47124a(21) =106377a(22) =240980a(23) =549272a(24) =1256609a(25) =2888057a(26) =6660347a(27) =15416623a(28) =35794121a(29) =83362301