Number of trees on n vertices which are not lobsters.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =0a(8) =0a(9) =1a(10) =4a(11) =19a(12) =77a(13) =287a(14) =1002a(15) =3365a(16) =10853a(17) =34088a(18) =104574a(19) =315116a(20) =935321a(21) =2743374a(22) =7966723a(23) =22951010a(24) =65681536a(25) =186961873a(26) =529845497a(27) =1496245171a(28) =4213181063a(29) =11836671278