Number of dissimilar forests on n nodes.

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =7a(5) =21a(6) =63a(7) =203a(8) =655a(9) =2225a(10) =7519a(11) =26279a(12) =91601a(13) =326873a(14) =1162873a(15) =4215645a(16) =15229413a(17) =55842223a(18) =204204265a(19) =755626769a(20) =2788876167a(21) =10398436275a(22) =38671589327a(23) =145061791275a(24) =542955212801