A112934 - OEIS

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A112934 as a simple table

n	a(n)
0	1
1	1
2	2
3	6
4	26
5	158
6	1282
7	13158
8	163354
9	2374078
10	39456386
11	737125446
12	15279024026
13	347786765150
14	8621313613954
15	231139787526822
16	6663177374810266
17	205503866668090750
18	6751565903597571842

[1,1,2,6,26,158,1282,13158,163354,2374078, 39456386,737125446,15279024026,347786765150, 8621313613954,231139787526822,6663177374810266, 205503866668090750,6751565903597571842]