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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.

A055974 Number of unlabeled digraphs with loops (relations) on n nodes and with an odd number of arcs.

Table of values

n a(n)
0 0
1 1
2 4
3 52
4 1504
5 145984
6 48461696
7 56141454464
8 229148544420864
9 3333310786076963968
10 174695272746603272722432
11 33301710992539090379269318144
12 23278728241293494481773139193036800
13 60084295633556503802059558812644803074048
14 576025077880237078776946485247979728479746359296

List of values

[0, 1, 4, 52, 1504, 145984, 48461696, 56141454464, 229148544420864, 3333310786076963968, 174695272746603272722432, 33301710992539090379269318144, 23278728241293494481773139193036800, 60084295633556503802059558812644803074048, 576025077880237078776946485247979728479746359296]

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

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