Denominators of average numbers of trees in a forest on n nodes.

Terms

a(0) =1a(1) =2a(2) =1a(3) =6a(4) =5a(5) =20a(6) =37a(7) =2a(8) =51a(9) =329a(10) =710a(11) =1601a(12) =118a(13) =8599a(14) =20514a(15) =49905a(16) =122963a(17) =307199a(18) =775529a(19) =988939a(20) =282591a(21) =6592078a(22) =131812a(23) =45164337a(24) =119237493a(25) =19774239a(26) =168670563a(27) =4514955632a(28) =4044075790a(29) =32717113805