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A001811 as a simple table

n a(n)
4 1
5 25
6 450
7 7350
8 117600
9 1905120
10 31752000
11 548856000
12 9879408000
13 185513328000
14 3636061228800
15 74373979680000
16 1586644899840000
17 35272336619520000
18 816302647480320000
19 19645683716026368000
20 491142092900659200000
21 12740803704070041600000

[1,25,450,7350,117600,1905120,31752000,548856000,
 9879408000,185513328000,3636061228800,
 74373979680000,1586644899840000,35272336619520000,
 816302647480320000,19645683716026368000,
 491142092900659200000,12740803704070041600000]

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Last modified May 31 07:22 EDT 2020. Contains 334747 sequences. (Running on oeis4.)