cp's OEIS Frontend

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.

A053154 Number of 2-element intersecting families (with not necessarily distinct sets) of an n-element set.

Table of values

n a(n)
0 0
1 1
2 5
3 22
4 95
5 406
6 1715
7 7162
8 29615
9 121486
10 495275
11 2009602
12 8124935
13 32761366
14 131834435
15 529712842
16 2125993055
17 8525430046
18 34166159195
19 136858084882
20 548012945975
21 2193794127526
22 8780404589555
23 35137304693722

List of values

[0, 1, 5, 22, 95, 406, 1715, 7162, 29615, 121486, 495275, 2009602, 8124935, 32761366, 131834435, 529712842, 2125993055, 8525430046, 34166159195, 136858084882, 548012945975, 2193794127526, 8780404589555, 35137304693722]

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

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