A146870 - OEIS

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A146870 as a simple table

n	a(n)
1	1
2	1
3	1
4	1
5	17
6	29
7	97
8	473
9	2981
10	21253
11	221233
12	1979801
13	27911349
14	414463777
15	10310356843
16	228677282931
17	8215295336657
18	272807472524325

[1,1,1,1,17,29,97,473,2981,21253,221233,1979801, 27911349,414463777,10310356843,228677282931, 8215295336657,272807472524325]