A168128 - OEIS

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A168128 as a simple table

n	a(n)
1	1
2	2
3	23
4	247
5	699
6	55921
7	70936
8	152730
9	478017
10	4879815
11	12909834588
12	223070292558
13	583407686653
14	601718433498

[1,2,23,247,699,55921,70936,152730,478017,4879815, 12909834588,223070292558,583407686653, 601718433498]