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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.

A175630 a(n) = n-th pentagonal number mod (n+2).

Table of values

n a(n)
0 0
1 1
2 1
3 2
4 4
5 0
6 3
7 7
8 2
9 7
10 1
11 7
12 0
13 7
14 15
15 7
16 16
17 7
18 17
19 7
20 18
21 7
22 19
23 7
24 20
25 7
26 21
27 7
28 22
29 7
30 23
31 7
32 24
33 7
34 25
35 7
36 26
37 7
38 27
39 7
40 28
41 7
42 29
43 7
44 30
45 7
46 31
47 7
48 32
49 7
50 33
51 7
52 34
53 7
54 35
55 7
56 36
57 7
58 37
59 7
60 38
61 7
62 39
63 7
64 40
65 7
66 41
67 7
68 42
69 7
70 43
71 7
72 44
73 7
74 45
75 7
76 46
77 7
78 47
79 7
80 48
81 7
82 49
83 7
84 50
85 7
86 51

List of values

[0, 1, 1, 2, 4, 0, 3, 7, 2, 7, 1, 7, 0, 7, 15, 7, 16, 7, 17, 7, 18, 7, 19, 7, 20, 7, 21, 7, 22, 7, 23, 7, 24, 7, 25, 7, 26, 7, 27, 7, 28, 7, 29, 7, 30, 7, 31, 7, 32, 7, 33, 7, 34, 7, 35, 7, 36, 7, 37, 7, 38, 7, 39, 7, 40, 7, 41, 7, 42, 7, 43, 7, 44, 7, 45, 7, 46, 7, 47, 7, 48, 7, 49, 7, 50, 7, 51]

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