Number of trees with n nodes and 6 leaves.

Terms

a(0) =1a(1) =3a(2) =9a(3) =26a(4) =66a(5) =158a(6) =350a(7) =727a(8) =1428a(9) =2679a(10) =4804a(11) =8308a(12) =13888a(13) =22539a(14) =35606a(15) =54935a(16) =82907a(17) =122712a(18) =178375a(19) =255085a(20) =359304a(21) =499179a(22) =684621a(23) =927943a(24) =1243918a(25) =1650519a(26) =2169112a(27) =2825336a(28) =3649246a(29) =4676552