A147914 - OEIS

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A147914 as a simple table

n	a(n)
1	1
2	2
3	6
4	16
5	74
6	384
7	1970
8	10282
9	65472
10	391386
11	2939090
12	20208896
13	147099900
14	1225118562
15	9901118700
16	97592995386

[1,2,6,16,74,384,1970,10282,65472,391386,2939090, 20208896,147099900,1225118562,9901118700, 97592995386]