A143522 - OEIS

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A143522 as a simple table

n	a(n)
0	1
1	2
2	5
3	18
4	93
5	618
6	4905
7	45162
8	474777
9	5618322
10	73895085
11	1069104258
12	16873062453
13	288485314938
14	5311769483025
15	104789840677722
16	2205098925335217
17	49302142664941602
18	1167150946521879765

[1,2,5,18,93,618,4905,45162,474777,5618322, 73895085,1069104258,16873062453,288485314938, 5311769483025,104789840677722,2205098925335217, 49302142664941602,1167150946521879765]