A147933 - OEIS

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A147933 as a simple table

n	a(n)
1	1
2	2
3	6
4	16
5	74
6	304
7	1424
8	7946
9	44418
10	271160
11	1760020
12	13590836
13	107901418
14	882093328
15	8656696052
16	83441646558

[1,2,6,16,74,304,1424,7946,44418,271160,1760020, 13590836,107901418,882093328,8656696052, 83441646558]