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A172556 as a simple table

n a(n)
1 20
2 1860
3 297200
4 60871300
5 14367744720
6 3718394156400
7 1026608414145600
8 297348703692826500
9 89365729945562642000
10 27658131940039664137360
11 8766913970029589057611200
12 2834492178580299130305958000

[20,1860,297200,60871300,14367744720,
 3718394156400,1026608414145600,297348703692826500,
 89365729945562642000,27658131940039664137360,
 8766913970029589057611200,
 2834492178580299130305958000]

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Last modified March 29 09:14 EDT 2024. Contains 371268 sequences. (Running on oeis4.)