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A156966 as a simple table

na(n)
01
1-21
2-46
315057
430866
5-9455061
6-57971086
7100495971849
8205339018706
9-114539909228451
10-1170144295531726
111595713259829366867
129781097564521728146
13-7881868435057254330441
14-112729760168857069885966
15838530133784555195034887913
161713286617447636818870543186

[1,-21,-46,15057,30866,-9455061,-57971086,
 100495971849,205339018706,-114539909228451,
 -1170144295531726,1595713259829366867,
 9781097564521728146,-7881868435057254330441,
 -112729760168857069885966,
 838530133784555195034887913,
 1713286617447636818870543186]