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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.

A030813 a(n) = floor(exp(16/23) * n!).

Table of values

n a(n)
1 2
2 4
3 12
4 48
5 240
6 1443
7 10105
8 80842
9 727580
10 7275803
11 80033833
12 960405999
13 12485277998
14 174793891980
15 2621908379701
16 41950534075224
17 713159079278809
18 12836863427018578
19 243900405113352992
20 4878008102267059852

List of values

[2, 4, 12, 48, 240, 1443, 10105, 80842, 727580, 7275803, 80033833, 960405999, 12485277998, 174793891980, 2621908379701, 41950534075224, 713159079278809, 12836863427018578, 243900405113352992, 4878008102267059852]

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

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