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A009673 as a simple table

na(n)
00
12
2-4
3246
4-6728
5614890
6-55387212
78450249822
8-1527219657616
9372125006557650
10-109398463655126420
1139693749843486489542
12-17074884680310522056664
138684084243275368565840826

[0,2,-4,246,-6728,614890,-55387212,8450249822,
 -1527219657616,372125006557650,
 -109398463655126420,39693749843486489542,
 -17074884680310522056664,
 8684084243275368565840826]