A147932 - OEIS

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A147932 as a simple table

n	a(n)
1	1
2	2
3	6
4	16
5	96
6	376
7	1924
8	10912
9	90032
10	563836
11	3920958
12	33396960
13	370390258
14	3235719046
15	30075123118
16	343158668698

[1,2,6,16,96,376,1924,10912,90032,563836,3920958, 33396960,370390258,3235719046,30075123118, 343158668698]