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A112115 as a simple table

na(n)
11
21
3-5
443
5-443
64957
7-57281
8661375
9-7430526
1079197417
11-778914398
126845802239
13-52074744048
14345158019601
15-2374391391323
1620218882229451
17-34682204747638
18-6385759551091470
19180067413599721613
20-2110513020510554883

[1,1,-5,43,-443,4957,-57281,661375,-7430526,
 79197417,-778914398,6845802239,-52074744048,
 345158019601,-2374391391323,20218882229451,
 -34682204747638,-6385759551091470,
 180067413599721613,-2110513020510554883]