A167148 - OEIS

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A167148 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	6453753955580
11	122621325156020
12	2329805177964380
13	44266298381323220
14	841059669245140990
15	15980133715657675200

[1,20,380,7220,137180,2606420,49521980,940917620, 17877434780,339671260820,6453753955580, 122621325156020,2329805177964380, 44266298381323220,841059669245140990, 15980133715657675200]