Number of components over all functions on n unlabeled nodes.

Terms

a(0) =1a(1) =4a(2) =11a(3) =33a(4) =88a(5) =254a(6) =697a(7) =1984a(8) =5585a(9) =15938a(10) =45424a(11) =130381a(12) =374450a(13) =1079361a(14) =3115291a(15) =9010177a(16) =26090857a(17) =75656608a(18) =219603868a(19) =638075127a(20) =1855506355a(21) =5399995044a(22) =15726096741a(23) =45827313178a(24) =133621409595a(25) =389814176004