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A321822 as a simple table

na(n)
11
21
3-728
41
515626
6-728
7-117648
81
9530713
1015626
11-1771560
12-728
134826810
14-117648
15-11375728
161
1724137570
18530713
19-47045880
2015626
2185647744
22-1771560
23-148035888
24-728
25244156251
264826810
27-386889776
28-117648
29594823322
30-11375728

[1,1,-728,1,15626,-728,-117648,1,530713,15626,
 -1771560,-728,4826810,-117648,-11375728,1,
 24137570,530713,-47045880,15626,85647744,-1771560,
 -148035888,-728,244156251,4826810,-386889776,
 -117648,594823322,-11375728]