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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.

A194827 2-adic valuation of the number of n X n Alternating Sign Matrices (A005130(n)).

Table of values

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

List of values

[0, 1, 0, 1, 0, 2, 2, 3, 2, 2, 0, 2, 2, 4, 4, 5, 4, 4, 2, 2, 0, 3, 4, 6, 6, 7, 6, 8, 8, 10, 10, 11, 10, 10, 8, 8, 6, 7, 6, 6, 4, 3, 0, 3, 4, 7, 8, 10, 10, 11, 10, 11, 10, 13, 14, 16, 16, 17, 16, 18, 18, 20, 20, 21, 20, 20, 18, 18, 16, 17, 16, 16, 14, 13, 10, 11, 10, 11, 10, 10]

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