A152335 - OEIS

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A152335 as a simple table

n	a(n)
1	1
2	2
3	6
4	24
5	120
6	640
7	4164
8	28224
9	237168
10	2133992
11	21136148
12	226558932
13	2656690332
14	33144866692
15	444798029884
16	6309964631348

[1,2,6,24,120,640,4164,28224,237168,2133992, 21136148,226558932,2656690332,33144866692, 444798029884,6309964631348]