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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A090616 Exponent of highest power of 4 dividing n!.

Table of values

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

List of values

[0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 5, 5, 7, 7, 8, 8, 9, 9, 9, 9, 11, 11, 11, 11, 12, 12, 13, 13, 15, 15, 16, 16, 17, 17, 17, 17, 19, 19, 19, 19, 20, 20, 21, 21, 23, 23, 23, 23, 24, 24, 25, 25, 26, 26, 27, 27, 28, 28, 28, 28, 31, 31, 32, 32, 33, 33, 33, 33, 35, 35, 35, 35, 36]

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