Number of unlabeled endofunctions on n points whose self-referencing elements are mapped from another element.

A381123

Number of unlabeled endofunctions on n points whose self-referencing elements are mapped from another element.

Terms

    a(0) =1a(1) =0a(2) =2a(3) =4a(4) =12a(5) =28a(6) =83a(7) =213a(8) =608a(9) =1664a(10) =4703a(11) =13173a(12) =37412a(13) =105995a(14) =302301a(15) =862794a(16) =2470631a(17) =7084425a(18) =20357121a(19) =58573788a(20) =168789684a(21) =486964114a(22) =1406549550a(23) =4066751083a(24) =11769363663a(25) =34090076148a(26) =98820914068a(27) =286672673725a(28) =832183340955

External references