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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.

A219965 Number of non-intersecting unit cubes regularly packed into the tetrahedron of edge length n.

Table of values

n a(n)
1 0
2 0
3 0
4 1
5 4
6 10
7 19
8 30
9 45
10 66
11 94
12 130
13 172
14 221
15 278
16 344
17 422
18 511
19 611
20 723
21 848
22 987
23 1140
24 1308
25 1491
26 1691
27 1909
28 2146
29 2401
30 2673
31 2965
32 3278
33 3614
34 3974
35 4355
36 4759
37 5186
38 5638
39 6117
40 6623
41 7156
42 7716
43 8305
44 8923
45 9571
46 10249
47 10958
48 11700
49 12475
50 13285
51 14127
52 15003
53 15914
54 16862
55 17849
56 18874
57 19937
58 21037
59 22177
60 23358
61 24581
62 25846
63 27153
64 28504

List of values

[0, 0, 0, 1, 4, 10, 19, 30, 45, 66, 94, 130, 172, 221, 278, 344, 422, 511, 611, 723, 848, 987, 1140, 1308, 1491, 1691, 1909, 2146, 2401, 2673, 2965, 3278, 3614, 3974, 4355, 4759, 5186, 5638, 6117, 6623, 7156, 7716, 8305, 8923, 9571, 10249, 10958, 11700, 12475, 13285, 14127, 15003, 15914, 16862, 17849, 18874, 19937, 21037, 22177, 23358, 24581, 25846, 27153, 28504]

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

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