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.

A051365 Number of 4-element families of an n-element set such that every 3 members of the family have a nonempty intersection.

Table of values

n a(n)
0 0
1 0
2 0
3 3
4 275
5 8475
6 192385
7 3831093
8 71466675
9 1285857975
10 22632300245
11 392522268633
12 6734698919575
13 114576024346875
14 1935649374363705
15 32505459713369373
16 543014736097852475
17 9029329231317194175
18 149522990698790644765
19 2466942184607949641313

List of values

[0, 0, 0, 3, 275, 8475, 192385, 3831093, 71466675, 1285857975, 22632300245, 392522268633, 6734698919575, 114576024346875, 1935649374363705, 32505459713369373, 543014736097852475, 9029329231317194175, 149522990698790644765, 2466942184607949641313]

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

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