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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.

A051367 Number of 5-element families of an n-element set such that every 4 members of the family have a nonempty intersection.

Table of values

n a(n)
0 0
1 0
2 0
3 0
4 224
5 21281
6 1144027
7 49310674
8 1915317642
9 70460566827
10 2513684751809
11 88008877380908
12 3043421159408080
13 104321464544910613
14 3552122530256316471
15 120307381384305672102

List of values

[0, 0, 0, 0, 224, 21281, 1144027, 49310674, 1915317642, 70460566827, 2513684751809, 88008877380908, 3043421159408080, 104321464544910613, 3552122530256316471, 120307381384305672102]

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

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