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A303394 as a simple table

na(n)
01
1-2
2-6
3-28
4-26
5-156
6-476
7968
811526
9-16172
10139724
11791928
121315548
1312772840
1431004424
15-105335920
161058225606
172239259700
18-3700870212
1929301955992
20-4944685836
21-526686535112
221134044530040
234057865621232
24-13063873857124
25-113573062924024

[1,-2,-6,-28,-26,-156,-476,968,11526,-16172,
 139724,791928,1315548,12772840,31004424,
 -105335920,1058225606,2239259700,-3700870212,
 29301955992,-4944685836,-526686535112,
 1134044530040,4057865621232,-13063873857124,
 -113573062924024]