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A291679 as a simple table

na(n)
01
11
21
3-2
4-11
5-24
6-8
7141
8573
91087
10-174
11-8700
12-31328
13-52740
1436387
15534198
161742445
172540583
18-3626189
19-33115232
20-97968686
21-118497822
22301668764
232060526393
245526622320
255165256226
26-23033840842
27-127995025736
28-310560935969
29-193716799472

[1,1,1,-2,-11,-24,-8,141,573,1087,-174,-8700,
 -31328,-52740,36387,534198,1742445,2540583,
 -3626189,-33115232,-97968686,-118497822,301668764,
 2060526393,5526622320,5165256226,-23033840842,
 -127995025736,-310560935969,-193716799472]