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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.

A178165 Number of unordered collections of distinct nonempty subsets of an n-element set where each element appears in at most 2 subsets.

Table of values

n a(n)
0 1
1 2
2 8
3 59
4 652
5 9736
6 186478
7 4421018
8 126317785
9 4260664251
10 166884941780
11 7489637988545
12 380861594219460
13 21739310882945458
14 1381634777325000263
15 97089956842985393297
16 7497783115765911443879
17 632884743974716421132084

List of values

[1, 2, 8, 59, 652, 9736, 186478, 4421018, 126317785, 4260664251, 166884941780, 7489637988545, 380861594219460, 21739310882945458, 1381634777325000263, 97089956842985393297, 7497783115765911443879, 632884743974716421132084]

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

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