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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.

A259897 a(n) is the 2-adic valuation of phi(binomial(2*n,n)).

Table of values

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

List of values

[0, 0, 1, 3, 3, 3, 4, 6, 6, 10, 9, 11, 10, 11, 11, 14, 12, 10, 11, 13, 14, 17, 17, 17, 16, 16, 18, 20, 22, 23, 21, 23, 20, 24, 21, 21, 20, 22, 24, 23, 22, 21, 22, 26, 26, 30, 31, 32, 30, 35, 34, 33, 31, 33, 34, 34, 33, 37, 38, 40, 42, 42, 44, 46, 42, 42, 43, 45]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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