Number of trees of diameter 5.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =1a(6) =2a(7) =7a(8) =14a(9) =32a(10) =58a(11) =110a(12) =187a(13) =322a(14) =519a(15) =839a(16) =1302a(17) =2015a(18) =3032a(19) =4542a(20) =6668a(21) =9738a(22) =14006a(23) =20036a(24) =28324a(25) =39830a(26) =55473a(27) =76875a(28) =105692a(29) =144629