A165094 - OEIS

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A165094 as a simple table

n	a(n)
1	0
2	21
3	252
4	147420
5	213402
6	1711962
7	16092433
8	76545756
9	1068263553
10	39258683100
11	57497839826
12	58573445322
13	68675650561
14	3680015145170
15	3749808363210
16	4238480197777
17	4397695901697
18	20104741893852

[0,21,252,147420,213402,1711962,16092433,76545756, 1068263553,39258683100,57497839826,58573445322, 68675650561,3680015145170,3749808363210, 4238480197777,4397695901697,20104741893852]