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A321828 as a simple table

na(n)
11
21
3-531440
41
5244140626
6-531440
7-13841287200
81
9282429005041
10244140626
11-3138428376720
12-531440
1323298085122482
14-13841287200
15-129746094281440
161
17582622237229762
18282429005041
19-2213314919066160
20244140626
217355813669568000

[1,1,-531440,1,244140626,-531440,-13841287200,1,
 282429005041,244140626,-3138428376720,-531440,
 23298085122482,-13841287200,-129746094281440,1,
 582622237229762,282429005041,-2213314919066160,
 244140626,7355813669568000]