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A089974 as a simple table

na(n)
01
10
2-3
31
417
5-49
6-71
71079
8-3263
9-10529
10156401
11-624601
12-1858319
1342109055
14-249633047
15-187690049
1617346988289
17-159631097281
18375894263521
198905140874583
20-137481700309199
21830604602372959
223549053339380121
23-139582700722475473
241526848956867592513

[1,0,-3,1,17,-49,-71,1079,-3263,-10529,156401,
 -624601,-1858319,42109055,-249633047,-187690049,
 17346988289,-159631097281,375894263521,
 8905140874583,-137481700309199,830604602372959,
 3549053339380121,-139582700722475473,
 1526848956867592513]