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A009498 as a simple table

na(n)
01
13
2-3
3-1113
4-77063
5-5509845
6-430006731
7-33282260529
8-1454472663311
9448480622503635
10254015086363619949
11101877925964986614135
1239296835590108099513833
1315506451718661316904568571

[1,3,-3,-1113,-77063,-5509845,-430006731,
 -33282260529,-1454472663311,448480622503635,
 254015086363619949,101877925964986614135,
 39296835590108099513833,
 15506451718661316904568571]