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A158820 as a simple table

na(n)
01
1-5
2-1
335
4-227
5-1435
627599
7123095
8-2428187
9-18154423
101002748195
114095412475
12-11278566075977
13-1310672758291
149265563303353
15564709713458975
16-387913690488413419
17-315149059886480239
18381102197975912820173
19221139612243078051395

[1,-5,-1,35,-227,-1435,27599,123095,-2428187,
 -18154423,1002748195,4095412475,-11278566075977,
 -1310672758291,9265563303353,564709713458975,
 -387913690488413419,-315149059886480239,
 381102197975912820173,221139612243078051395]