A073391 - OEIS

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A073391 as a simple table

n	a(n)
0	1
1	10
2	70
3	400
4	2020
5	9352
6	40600
7	167680
8	665440
9	2555840
10	9551936
11	34880000
12	124853120
13	439228160
14	1521839360
15	5202292736
16	17571249920
17	58712184320
18	194280061440
19	637228462080
20	2073332481024
21	6696470231040

[1,10,70,400,2020,9352,40600,167680,665440, 2555840,9551936,34880000,124853120,439228160, 1521839360,5202292736,17571249920,58712184320, 194280061440,637228462080,2073332481024, 6696470231040]