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A318908 as a simple table

na(n)
11
2-1
33
427
5-89
6-1057
748771
8-178481
99099507
10128207979
11-483939977
12-6958934353
1326494256091
14-21862134113449
1584179432287299
16-72624976668147841
17281629680514649643
184246732448623781667
19-250191601741438157017
2014833445639443302757131
21-57912614113275649087721
223457933070629553840500347
23-207403566791267899459539137
24-3185051759367410556524379913

[1,-1,3,27,-89,-1057,48771,-178481,9099507,
 128207979,-483939977,-6958934353,26494256091,
 -21862134113449,84179432287299,-72624976668147841,
 281629680514649643,4246732448623781667,
 -250191601741438157017,14833445639443302757131,
 -57912614113275649087721,
 3457933070629553840500347,
 -207403566791267899459539137,
 -3185051759367410556524379913]