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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.

A123553 A "king chicken" in a tournament graph (a directed labeled graph on n nodes with a single arc between every pair of nodes) is a player A who for any other player B either beats B directly or beats someone who beats B. Sequence gives total number of king chickens in all 2^(n(n-1)/2) tournaments.

Table of values

n a(n)
1 1
2 2
3 12
4 128
5 2680
6 109824
7 8791552
8 1376518144
9 422360211456
10 254460936847360
11 301592785058791424
12 704473043710859280384
13 3248469673423387574140928
14 29616255381502146777580568576
15 534589619577015738514639410954240
16 19128875195554152154920492396852543488

List of values

[1, 2, 12, 128, 2680, 109824, 8791552, 1376518144, 422360211456, 254460936847360, 301592785058791424, 704473043710859280384, 3248469673423387574140928, 29616255381502146777580568576, 534589619577015738514639410954240, 19128875195554152154920492396852543488]

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

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