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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.

A055484 Number of unlabeled 3-element intersecting families (with not necessarily distinct sets) of an n-element set.

Table of values

n a(n)
1 1
2 4
3 14
4 39
5 96
6 213
7 437
8 837
9 1520
10 2632
11 4380
12 7040
13 10979
14 16668
15 24716
16 35879
17 51104
18 71549
19 98625
20 134025
21 179782
22 238292
23 312386
24 405368
25 521083
26 663968
27 839140
28 1052439
29 1310534
30 1620985
31 1992343
32 2434229
33 2957458
34 3574108

List of values

[1, 4, 14, 39, 96, 213, 437, 837, 1520, 2632, 4380, 7040, 10979, 16668, 24716, 35879, 51104, 71549, 98625, 134025, 179782, 238292, 312386, 405368, 521083, 663968, 839140, 1052439, 1310534, 1620985, 1992343, 2434229, 2957458, 3574108]

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

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