A165882 - OEIS

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A165882 as a simple table

n	a(n)
0	1
1	20
2	380
3	7220
4	137180
5	2606420
6	49521980
7	940917620
8	17877434780
9	339671260820
10	6453753955390
11	122621325148800
12	2329805177758800
13	44266298376117600
14	841059669121542000
15	15980133712840142400

[1,20,380,7220,137180,2606420,49521980,940917620, 17877434780,339671260820,6453753955390, 122621325148800,2329805177758800, 44266298376117600,841059669121542000, 15980133712840142400]