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A015266 as a simple table

na(n)
31
4-5
555
6-385
73311
8-25585
9208335
10-1652145
1113275471
12-105970865
13848699215
14-6785865905
1554301841231
16-434355079345
173475079247695
18-27799679551665
19222401254176591
20-1779194762447025
2114233619183613775

[1,-5,55,-385,3311,-25585,208335,-1652145,
 13275471,-105970865,848699215,-6785865905,
 54301841231,-434355079345,3475079247695,
 -27799679551665,222401254176591,-1779194762447025,
 14233619183613775]