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.

A002638 a(n) = (number of nonisomorphic nontransitive prime tournaments on n nodes) - Moebius(n).

Table of values

n a(n)
1 -1
2 1
3 2
4 3
5 12
6 52
7 456
8 6873
9 191532
10 9733032
11 903753248
12 154108311046
13 48542114686912
14 28401423719121392
15 31021002160355166800
16 63530415842308265086523
17 244912778438520759443245824
18 1783398846284777975419599903948
19 24605641171260376770598003978281472

List of values

[-1, 1, 2, 3, 12, 52, 456, 6873, 191532, 9733032, 903753248, 154108311046, 48542114686912, 28401423719121392, 31021002160355166800, 63530415842308265086523, 244912778438520759443245824, 1783398846284777975419599903948, 24605641171260376770598003978281472]

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

Content is available under The OEIS End-User License Agreement.