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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.

A323295 Number of ways to fill a matrix with the first n positive integers.

Table of values

n a(n)
0 1
1 1
2 4
3 12
4 72
5 240
6 2880
7 10080
8 161280
9 1088640
10 14515200
11 79833600
12 2874009600
13 12454041600
14 348713164800
15 5230697472000
16 104613949440000
17 711374856192000
18 38414242234368000
19 243290200817664000
20 14597412049059840000
21 204363768686837760000

List of values

[1, 1, 4, 12, 72, 240, 2880, 10080, 161280, 1088640, 14515200, 79833600, 2874009600, 12454041600, 348713164800, 5230697472000, 104613949440000, 711374856192000, 38414242234368000, 243290200817664000, 14597412049059840000, 204363768686837760000]

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

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