A144010 - OEIS

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A144010 as a simple table

n	a(n)
0	1
1	1
2	1
3	4
4	21
5	160
6	1525
7	17760
8	243145
9	3833600
10	68373225
11	1361264000
12	29925477725
13	719991897600
14	18817847565725
15	530921477363200
16	16082605690148625
17	520603130117939200
18	17934634668874889425

[1,1,1,4,21,160,1525,17760,243145,3833600, 68373225,1361264000,29925477725,719991897600, 18817847565725,530921477363200,16082605690148625, 520603130117939200,17934634668874889425]