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A119460 as a simple table

na(n)
11
21
31
4-1
53
6-3
76
8-15
958
10-64
11198
12-476
131179
14-2907
158377
16-19917
1769243
18-131621
19379716
20-995100
212878526
22-7230486
2321469716
24-54741166
25156719748
26-417925683
271220839292
28-3221204589
299501389898
30-25010664810
3173038583431
32-197176327311
33595340630241

[1,1,1,-1,3,-3,6,-15,58,-64,198,-476,1179,-2907,
 8377,-19917,69243,-131621,379716,-995100,2878526,
 -7230486,21469716,-54741166,156719748,-417925683,
 1220839292,-3221204589,9501389898,-25010664810,
 73038583431,-197176327311,595340630241]