A146383 - OEIS

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A146383 as a simple table

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	6
7	1
8	20
9	13
10	138
11	69
12	1792
13	528
14	26977
15	7033
16	655185
17	141904
18	24548006
19	4322355
20	1409242126
21	197401178
22	123270232283
23	13868215311
24	16071746508178
25	1479290583806
26	3212023185510693

[1,1,1,1,1,6,1,20,13,138,69,1792,528,26977,7033, 655185,141904,24548006,4322355,1409242126, 197401178,123270232283,13868215311,16071746508178, 1479290583806,3212023185510693]