Triangle giving number of trees with n >= 3 nodes and diameter d >= 2.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =2a(8) =2a(9) =1a(10) =1a(11) =2a(12) =5a(13) =2a(14) =1a(15) =1a(16) =3a(17) =8a(18) =7a(19) =3a(20) =1a(21) =1a(22) =3a(23) =14a(24) =14a(25) =11a(26) =3a(27) =1a(28) =1a(29) =4