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A081993 as a simple table

n a(n)
1 1
2 55
3 3330
4 5833350
5 11199999998880
6 642096000000065520
7 84083999999999159160
8 853092240000000006366360
9 21033492480000000001383782400
10 181960466688000000000107035568640

[1,55,3330,5833350,11199999998880,
 642096000000065520,84083999999999159160,
 853092240000000006366360,
 21033492480000000001383782400,
 181960466688000000000107035568640]

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Last modified October 27 23:26 EDT 2020. Contains 338047 sequences. (Running on oeis4.)