A147890 - OEIS

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A147890 as a simple table

n	a(n)
1	1
2	2
3	6
4	24
5	96
6	444
7	3172
8	16976
9	112790
10	839320
11	7525858
12	86947336
13	816752748
14	8170308628
15	90956874778
16	1199823762964

[1,2,6,24,96,444,3172,16976,112790,839320,7525858, 86947336,816752748,8170308628,90956874778, 1199823762964]