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A007447 as a simple table

na(n)
12
2-1
33
4-12
559
6-354
72535
8-21190
9202731
10-2183462
1126130441
12-343956264
134938891841
14-76827253854
151287026203647
16-23100628140676
17442271719973507
18-8996704216880580
19193776558133638811
20-4405549734148088108
21105432710994387193283
22-2649353692976978990070

[2,-1,3,-12,59,-354,2535,-21190,202731,-2183462,
 26130441,-343956264,4938891841,-76827253854,
 1287026203647,-23100628140676,442271719973507,
 -8996704216880580,193776558133638811,
 -4405549734148088108,105432710994387193283,
 -2649353692976978990070]