A147895 - OEIS

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A147895 as a simple table

n	a(n)
1	1
2	2
3	6
4	24
5	96
6	456
7	2134
8	12418
9	81178
10	625138
11	4275412
12	32681806
13	305356674
14	3193552544
15	29875677830
16	301075498104

[1,2,6,24,96,456,2134,12418,81178,625138,4275412, 32681806,305356674,3193552544,29875677830, 301075498104]