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A303402 as a simple table

na(n)
01
1-8
224
3-72
4344
5-1416
65400
7-21576
887000
9-348296
101390872
11-5560776
1222253784
13-89025672
14356055960
15-1424186568
165696931032
17-22787865096
1891150729368
19-364602357960
201458412314456
21-5833651510536
2223334594559128
23-93338369011272
24373353522099288

[1,-8,24,-72,344,-1416,5400,-21576,87000,-348296,
 1390872,-5560776,22253784,-89025672,356055960,
 -1424186568,5696931032,-22787865096,91150729368,
 -364602357960,1458412314456,-5833651510536,
 23334594559128,-93338369011272,373353522099288]