Number of partial mappings (or mapping patterns) from n points to themselves; number of partial endofunctions.

A126285

Number of partial mappings (or mapping patterns) from n points to themselves; number of partial endofunctions.

Terms

    a(0) =1a(1) =2a(2) =6a(3) =16a(4) =45a(5) =121a(6) =338a(7) =929a(8) =2598a(9) =7261a(10) =20453a(11) =57738a(12) =163799a(13) =465778a(14) =1328697a(15) =3798473a(16) =10883314a(17) =31237935a(18) =89812975a(19) =258595806a(20) =745563123a(21) =2152093734a(22) =6218854285a(23) =17988163439a(24) =52078267380a(25) =150899028305a(26) =437571778542

External references