A009167 - OEIS

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A009167 as a simple table

n	a(n)
0	1
1	1
2	21
3	717
4	38857
5	3158329
6	363525789
7	56250039237
8	11210469917713
9	2783865475754737
10	840008000833503141
11	302092032859131150141
12	127513257396264637784281
13	62381091849825754078253353

[1,1,21,717,38857,3158329,363525789,56250039237, 11210469917713,2783865475754737, 840008000833503141,302092032859131150141, 127513257396264637784281, 62381091849825754078253353]