Floor of the expected value of number of trials until exactly two cells are empty in a random distribution of n balls in n cells.

A210113

Floor of the expected value of number of trials until exactly two cells are empty in a random distribution of n balls in n cells.

Terms

    a(0) =9a(1) =3a(2) =2a(3) =1a(4) =2a(5) =3a(6) =4a(7) =7a(8) =12a(9) =21a(10) =40a(11) =75a(12) =147a(13) =292a(14) =594a(15) =1229a(16) =2582a(17) =5499a(18) =11859a(19) =25868a(20) =57008a(21) =126814a(22) =284523a(23) =643401a(24) =1465511a(25) =3360493a(26) =7753730a(27) =17993787a(28) =41982506a(29) =98445184

External references