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A162852 as a simple table

na(n)
13
2-1
39
4-3
527
6-9
781
8-27
9243
10-81
11729
12-243
132187
14-729
156561
16-2187
1719683
18-6561
1959049
20-19683
21177147
22-59049
23531441
24-177147
251594323
26-531441
274782969
28-1594323
2914348907
30-4782969
3143046721
32-14348907
33129140163

[3,-1,9,-3,27,-9,81,-27,243,-81,729,-243,2187,
 -729,6561,-2187,19683,-6561,59049,-19683,177147,
 -59049,531441,-177147,1594323,-531441,4782969,
 -1594323,14348907,-4782969,43046721,-14348907,
 129140163]