A222971 - OEIS

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A222971 as a simple table

n	a(n)
1	1
2	6
3	96
4	576
5	5180
6	28836
7	222887
8	1241310
9	8712264
10	48837168
11	328280478
12	1854039060
13	12126536066
14	69047705664
15	443482507552
16	2544063717888
17	16136462307440
18	93109093464048
19	585311170019020
20	3393940344415872

[1,6,96,576,5180,28836,222887,1241310,8712264, 48837168,328280478,1854039060,12126536066, 69047705664,443482507552,2544063717888, 16136462307440,93109093464048,585311170019020, 3393940344415872]