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A136592 as a simple table

na(n)
21
33
4-13
5-10
6394
7-2016
8-5076
9170064
10-1155024
11-5005440
12193724640
13-1656720000
14-10280355840
15465087087360
16-4804977542400
17-39012996556800
182035558551398400
19-24660231399014400
20-248246498826547200
2114713557956794368000

[1,3,-13,-10,394,-2016,-5076,170064,-1155024,
 -5005440,193724640,-1656720000,-10280355840,
 465087087360,-4804977542400,-39012996556800,
 2035558551398400,-24660231399014400,
 -248246498826547200,14713557956794368000]