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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.

A023818 Sum of exponents in prime-power factorization of C(2n,n-2).

Table of values

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

List of values

[0, 2, 3, 5, 4, 4, 6, 8, 6, 7, 8, 9, 8, 10, 11, 12, 11, 11, 12, 14, 11, 12, 14, 15, 13, 15, 16, 16, 13, 13, 17, 19, 14, 16, 18, 17, 15, 18, 19, 22, 20, 20, 21, 24, 21, 20, 23, 24, 23, 24, 22, 23, 22, 23, 24, 25, 22, 24, 27, 27, 22, 26, 29, 30, 26, 26, 28, 30, 27, 28, 31, 31, 29, 31, 31, 33, 31, 28, 31]

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