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A012826 as a simple table

na(n)
01
1-1
2-7
3-145
4-2063
5-128705
65154217
7-510686033
8254809389793
9-27371394484993
1018728499608356185
11-5038330344345849489
123197858289863468529361
13-1630641802209014177997505

[1,-1,-7,-145,-2063,-128705,5154217,-510686033,
 254809389793,-27371394484993,18728499608356185,
 -5038330344345849489,3197858289863468529361,
 -1630641802209014177997505]