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A009816 as a simple table

na(n)
00
12
212
3-98
4-16968
5-1022758
613538052
718891204022
83769346994672
9123100068974642
10-253651389915077508
11-122777845265771787698
12-18798053944871656928088
1318504747132976573022229002

[0,2,12,-98,-16968,-1022758,13538052,18891204022,
 3769346994672,123100068974642,-253651389915077508,
 -122777845265771787698,-18798053944871656928088,
 18504747132976573022229002]