Number of trees on n unlabeled nodes with all nodes of degree <= 7.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =3a(6) =6a(7) =11a(8) =23a(9) =46a(10) =104a(11) =230a(12) =539a(13) =1270a(14) =3081a(15) =7536a(16) =18785a(17) =47207a(18) =120074a(19) =307739a(20) =795426a(21) =2069248a(22) =5418014a(23) =14263084a(24) =37742929a(25) =100331646a(26) =267854040a(27) =717863832a(28) =1930888297a(29) =5210968114