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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.

A259506 a(n) = floor((LogGamma(n/2+1) - n*log(Pi)/2)/Pi).

Table of values

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

List of values

[0, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 7, 7, 7, 8, 8, 8, 9, 9, 9, 10, 10, 10, 11, 11, 11, 12, 12, 12, 13, 13, 13, 14, 14, 15, 15, 15, 16, 16, 16, 17, 17, 18]

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