A143437 - OEIS

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A143437 as a simple table

n	a(n)
0	1
1	1
2	5
3	40
4	405
5	4745
6	61551
7	862050
8	12831835
9	200874055
10	3282575310
11	55693595381
12	977058059380
13	17668078651755
14	328497282637520
15	6267311264123850
16	122498870023756800
17	2449635783413544555

[1,1,5,40,405,4745,61551,862050,12831835, 200874055,3282575310,55693595381,977058059380, 17668078651755,328497282637520,6267311264123850, 122498870023756800,2449635783413544555]