A068772 - OEIS

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A068772 as a simple table

n	a(n)
0	1
1	1
2	20
3	410
4	8600
5	184200
6	4020000
7	89205000
8	2008700000
9	45816140000
10	1056825200000
11	24618524200000
12	578457724000000
13	13695679012000000
14	326448619920000000
15	7827776361090000000
16	188701194087000000000

[1,1,20,410,8600,184200,4020000,89205000, 2008700000,45816140000,1056825200000, 24618524200000,578457724000000,13695679012000000, 326448619920000000,7827776361090000000, 188701194087000000000]