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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.

A023817 Sum of exponents in prime-power factorization of C(2n,n-1).

Table of values

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

List of values

[0, 2, 2, 4, 4, 6, 4, 7, 6, 7, 6, 9, 8, 11, 9, 12, 9, 13, 10, 13, 12, 13, 12, 15, 14, 14, 14, 16, 14, 17, 12, 18, 16, 16, 15, 18, 15, 18, 17, 20, 19, 22, 20, 22, 22, 23, 20, 25, 21, 24, 22, 24, 22, 25, 21, 24, 22, 24, 23, 28, 26, 27, 26, 29, 25, 27, 25, 30, 28, 30, 26, 32, 29, 31, 31, 31, 31, 34, 29, 32]

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