A162572 - OEIS

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A162572 as a simple table

n	a(n)
1	1
2	2
3	3
4	4
5	5
6	6
7	7
8	8
9	13
10	23
11	46
12	445
13	2116
14	15226
15	313725
16	1527465
17	3454446
18	2426472326
19	3066511287
20	102461381175475216

[1,2,3,4,5,6,7,8,13,23,46,445,2116,15226,313725, 1527465,3454446,2426472326,3066511287, 102461381175475216]