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.

A052390 Number of 4-element intersecting families (with not necessarily distinct sets) whose union is an n-element set.

Table of values

n a(n)
1 1
2 7
3 71
4 956
5 15116
6 254397
7 4318511
8 72331966
9 1188180386
10 19152566087
11 303768582701
12 4755204310776
13 73675434833456
14 1132450098258577
15 17301032324486891
16 263098797953058386
17 3987051131522775326

List of values

[1, 7, 71, 956, 15116, 254397, 4318511, 72331966, 1188180386, 19152566087, 303768582701, 4755204310776, 73675434833456, 1132450098258577, 17301032324486891, 263098797953058386, 3987051131522775326]

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

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