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A007757 as a simple table

n a(n)
1 1
2 2
3 36
4 144
5 1440
6 17280
7 241920
8 29030400
9 1567641600
10 156764160000
11 217275125760000
12 1738201006080000
13 45193226158080000
14 3796230997278720000
15 113886929918361600000
16 1822190878693785600000
17 22489479824838701875200000
18 28336744579296764362752000000
19 1076796294013277045784576000000
20 1679802218660712191423938560000000

[1,2,36,144,1440,17280,241920,29030400,1567641600,
 156764160000,217275125760000,1738201006080000,
 45193226158080000,3796230997278720000,
 113886929918361600000,1822190878693785600000,
 22489479824838701875200000,
 28336744579296764362752000000,
 1076796294013277045784576000000,
 1679802218660712191423938560000000]

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Last modified October 14 15:02 EDT 2019. Contains 328019 sequences. (Running on oeis4.)