Number of rooted trees with n nodes and 3 leaves.

Terms

a(0) =1a(1) =3a(2) =8a(3) =18a(4) =35a(5) =62a(6) =103a(7) =161a(8) =241a(9) =348a(10) =487a(11) =664a(12) =886a(13) =1159a(14) =1491a(15) =1890a(16) =2364a(17) =2922a(18) =3574a(19) =4329a(20) =5198a(21) =6192a(22) =7322a(23) =8600a(24) =10039a(25) =11651a(26) =13450a(27) =15450a(28) =17665a(29) =20110