Number of forests of different trees.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =3a(5) =6a(6) =12a(7) =24a(8) =49a(9) =105a(10) =231a(11) =517a(12) =1188a(13) =2783a(14) =6643a(15) =16101a(16) =39606a(17) =98605a(18) =248287a(19) =631214a(20) =1618878a(21) =4183964a(22) =10889305a(23) =28517954a(24) =75111521a(25) =198851386a(26) =528929895a(27) =1412993746a(28) =3789733399a(29) =10201625514