A141761 - OEIS

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A141761 as a simple table

n	a(n)
0	1
1	1
2	1
3	2
4	6
5	26
6	154
7	1188
8	11474
9	134432
10	1863168
11	29936846
12	548625820
13	11315025894
14	259733293774
15	6574304470320
16	182050022755386
17	5477819548007438
18	178054691097463354
19	6220193033111607018

[1,1,1,2,6,26,154,1188,11474,134432,1863168, 29936846,548625820,11315025894,259733293774, 6574304470320,182050022755386,5477819548007438, 178054691097463354,6220193033111607018]