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A112111 as a simple table

na(n)
11
21
3-3
417
5-115
6841
7-6288
846174
9-320366
101997348
11-10216611
1232418767
1368603755
14-1909624513
1515239954041
16-103620859984
171499179409198
18-25808959095992
19258001631302410
20-239530586418995
21-25424691109062239
2284868851253494310

[1,1,-3,17,-115,841,-6288,46174,-320366,1997348,
 -10216611,32418767,68603755,-1909624513,
 15239954041,-103620859984,1499179409198,
 -25808959095992,258001631302410,-239530586418995,
 -25424691109062239,84868851253494310]