A223753 - OEIS

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A223753 as a simple table

n	a(n)
1	20
2	200
3	2826
4	26980
5	308268
6	2964940
7	31799477
8	308289440
9	3225261237
10	31480928780
11	325138005739
12	3188808158080
13	32682606118057
14	321645620626780
15	3280008824707825
16	32362636113497810
17	328859264823219200

[20,200,2826,26980,308268,2964940,31799477, 308289440,3225261237,31480928780,325138005739, 3188808158080,32682606118057,321645620626780, 3280008824707825,32362636113497810, 328859264823219200]