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

A127912

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

Terms

    a(0) =0a(1) =1a(2) =3a(3) =10a(4) =27a(5) =79a(6) =218a(7) =622a(8) =1753a(9) =5007a(10) =14274a(11) =40954a(12) =117548a(13) =338485a(14) =975721a(15) =2817871a(16) =8146510a(17) =23581381a(18) =68322672a(19) =198138512a(20) =575058726a(21) =1670250623a(22) =4854444560a(23) =14117859226a(24) =41081418963a(25) =119606139728

External references