A267793 - OEIS

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A267793 as a simple table

n	a(n)
1	20
2	400
3	8000
4	102954
5	1234716
6	13126812
7	132388406
8	1271314080
9	11831791048
10	107394660068
11	957081246026
12	8408442934462
13	73058790472446
14	629272663467509
15	5382292144211926
16	45776729662954256
17	387532677732355814

[20,400,8000,102954,1234716,13126812,132388406, 1271314080,11831791048,107394660068,957081246026, 8408442934462,73058790472446,629272663467509, 5382292144211926,45776729662954256, 387532677732355814]