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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.

A350188 Consider a 2D sandpile model where each site with 3 or more grains, say at location (x, y), topples and transfers one grain of sand to the sites at locations (x+1, y-1), (x+1, y) and (x+1, y+1); a(n) gives the number of nonempty sites after stabilization of a configuration starting with n grains at the origin.

Table of values

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

List of values

[0, 1, 1, 3, 4, 4, 3, 4, 4, 7, 8, 8, 10, 11, 11, 10, 11, 11, 14, 15, 15, 17, 18, 18, 17, 18, 18, 21, 22, 22, 24, 25, 25, 24, 25, 25, 27, 28, 28, 30, 31, 31, 30, 31, 31, 36, 37, 37, 39, 40, 40, 39, 40, 40, 39, 40, 40, 42, 43, 43, 42, 43, 43, 45, 46, 46, 48, 49]

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

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