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A009216 as a simple table

na(n)
01
11
2-1
3-3
49
517
6-145
721
82961
9-9119
10-58273
11530541
12177177
13-24815503
14109736783
15845196933
16-11562650847
179274089409
18818943535295
19-6145817165859
20-30817061557719
21818240768280017
22-3016149953173201
23-67401109608160779

[1,1,-1,-3,9,17,-145,21,2961,-9119,-58273,530541,
 177177,-24815503,109736783,845196933,-11562650847,
 9274089409,818943535295,-6145817165859,
 -30817061557719,818240768280017,-3016149953173201,
 -67401109608160779]