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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.

A001001 Number of sublattices of index n in generic 3-dimensional lattice.

Table of values

n a(n)
1 1
2 7
3 13
4 35
5 31
6 91
7 57
8 155
9 130
10 217
11 133
12 455
13 183
14 399
15 403
16 651
17 307
18 910
19 381
20 1085
21 741
22 931
23 553
24 2015
25 806
26 1281
27 1210
28 1995
29 871
30 2821
31 993
32 2667
33 1729
34 2149
35 1767
36 4550
37 1407
38 2667
39 2379
40 4805
41 1723
42 5187
43 1893
44 4655
45 4030
46 3871
47 2257
48 8463
49 2850
50 5642
51 3991
52 6405
53 2863

List of values

[1, 7, 13, 35, 31, 91, 57, 155, 130, 217, 133, 455, 183, 399, 403, 651, 307, 910, 381, 1085, 741, 931, 553, 2015, 806, 1281, 1210, 1995, 871, 2821, 993, 2667, 1729, 2149, 1767, 4550, 1407, 2667, 2379, 4805, 1723, 5187, 1893, 4655, 4030, 3871, 2257, 8463, 2850, 5642, 3991, 6405, 2863]