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A100521 as a simple table

n a(n)
0 1
1 4
2 72
3 1200
4 19600
5 635040
6 25613280
7 82450368
8 9275666400
9 595703908800
10 2048086772160
11 23459903026560
12 413676290035008
13 4419618483280000
14 3221901874311120000
15 361282596839420256000
16 2630246784565779288000
17 9628029406360113091200
18 1310481780310126504080000

[1,4,72,1200,19600,635040,25613280,82450368,
 9275666400,595703908800,2048086772160,
 23459903026560,413676290035008,4419618483280000,
 3221901874311120000,361282596839420256000,
 2630246784565779288000,9628029406360113091200,
 1310481780310126504080000]

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Last modified July 6 08:46 EDT 2024. Contains 374034 sequences. (Running on oeis4.)