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A161742 as a simple table

na(n)
21
34
413
530
6-14
7-504
8736
944640
10-104544
11-10644480
1233246720
135425056000
14-20843695872
15-5185511654400
1623457840537600
178506857655296000
18-44092609863966720
19-22430879475779174400
20130748316971139072000

[1,4,13,30,-14,-504,736,44640,-104544,-10644480,
 33246720,5425056000,-20843695872,-5185511654400,
 23457840537600,8506857655296000,
 -44092609863966720,-22430879475779174400,
 130748316971139072000]