Number of forests on unlabeled nodes with n edges and no single node trees.

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =8a(5) =16a(6) =34a(7) =71a(8) =154a(9) =341a(10) =768a(11) =1765a(12) =4134a(13) =9838a(14) =23766a(15) =58226a(16) =144353a(17) =361899a(18) =916152a(19) =2339912a(20) =6023447a(21) =15617254a(22) =40752401a(23) =106967331a(24) =282267774a(25) =748500921a(26) =1993727506a(27) =5332497586a(28) =14316894271a(29) =38574473086