A159311 - OEIS

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A159311 as a simple table

n	a(n)
0	1
1	1
2	2
3	6
4	26
5	150
6	1066
7	8862
8	83506
9	874302
10	10035538
11	125082870
12	1680770250
13	24211249062
14	372151797498
15	6080329604238
16	105238649649762
17	1923853815102030
18	37047429233963170
19	749689860387252966

[1,1,2,6,26,150,1066,8862,83506,874302,10035538, 125082870,1680770250,24211249062,372151797498, 6080329604238,105238649649762,1923853815102030, 37047429233963170,749689860387252966]