Number of trees that have a maximum 'n'.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =2a(5) =4a(6) =5a(7) =10a(8) =10a(9) =20a(10) =25a(11) =50a(12) =52a(13) =104a(14) =130a(15) =260a(16) =260a(17) =520a(18) =650a(19) =1300a(20) =1352a(21) =2704a(22) =3380a(23) =6760a(24) =6770a(25) =13540a(26) =16925a(27) =33850a(28) =35204a(29) =70408