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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.

A307097 Number of configurations in the repeating cycle of the sandpile model in a bounded square of size 2n+1.

Table of values

n a(n)
1 2
2 4
3 4
4 4
5 6
6 6
7 8
8 6
9 10
10 18
11 26
12 10
13 10
14 8
15 12
16 30
17 8
18 32
19 14
20 32
21 52
22 26
23 60
24 52
25 34
26 74
27 14
28 80
29 36
30 38
31 24
32 54
33 26
34 30
35 36
36 58
37 22
38 14
39 26
40 36
41 38
42 20
43 36
44 60
45 24
46 24
47 18
48 14
49 24
50 34
51 70
52 104
53 48
54 56
55 36
56 50
57 50
58 48
59 152
60 28
61 110
62 30
63 172
64 64
65 104
66 158
67 150
68 60
69 36
70 186
71 52
72 50

List of values

[2, 4, 4, 4, 6, 6, 8, 6, 10, 18, 26, 10, 10, 8, 12, 30, 8, 32, 14, 32, 52, 26, 60, 52, 34, 74, 14, 80, 36, 38, 24, 54, 26, 30, 36, 58, 22, 14, 26, 36, 38, 20, 36, 60, 24, 24, 18, 14, 24, 34, 70, 104, 48, 56, 36, 50, 50, 48, 152, 28, 110, 30, 172, 64, 104, 158, 150, 60, 36, 186, 52, 50]

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

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