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A209899 Floor of the expected number of empty cells in a random placement of 2n balls into n cells.

Table of values

n a(n)
1 0
2 0
3 0
4 0
5 0
6 0
7 0
8 0
9 1
10 1
11 1
12 1
13 1
14 1
15 1
16 2
17 2
18 2
19 2
20 2
21 2
22 2
23 2
24 3
25 3
26 3
27 3
28 3
29 3
30 3
31 4
32 4
33 4
34 4
35 4
36 4
37 4
38 5
39 5
40 5
41 5
42 5
43 5
44 5
45 5
46 6
47 6
48 6
49 6
50 6
51 6
52 6
53 7
54 7
55 7
56 7
57 7
58 7
59 7
60 7
61 8
62 8
63 8
64 8
65 8
66 8
67 8
68 9
69 9
70 9
71 9
72 9
73 9
74 9
75 10
76 10
77 10
78 10
79 10
80 10
81 10
82 10
83 11
84 11

List of values

[0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 10, 11, 11]

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