A159594 - OEIS

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A159594 as a simple table

n	a(n)
1	1
2	1
3	3
4	16
5	125
6	1301
7	17070
8	272976
9	5218727
10	118508219
11	3224104875
12	108226321884
13	4740041705554
14	291705715765328
15	26728599026539162
16	3688459631229579912
17	751246585455211054713
18	208348432365596381718906

[1,1,3,16,125,1301,17070,272976,5218727,118508219, 3224104875,108226321884,4740041705554, 291705715765328,26728599026539162, 3688459631229579912,751246585455211054713, 208348432365596381718906]