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A258723 as a simple table

na(n)
01
16
230
3108
454
5-3564
6-41364
7-314280
8-1798362
9-6972156
10-1793340
11283697640
123341429820
1325984971720
14151750943640
15596184213168
16101849014278
17-25747257110940
18-305001821608236
19-2392882855430328
20-14088646343199276
21-55649498057805096
22-7100681134947480

[1,6,30,108,54,-3564,-41364,-314280,-1798362,
 -6972156,-1793340,283697640,3341429820,
 25984971720,151750943640,596184213168,
 101849014278,-25747257110940,-305001821608236,
 -2392882855430328,-14088646343199276,
 -55649498057805096,-7100681134947480]