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A321823 as a simple table

na(n)
11
21
3-2186
41
578126
6-2186
7-823542
81
94780783
1078126
11-19487170
12-2186
1362748518
14-823542
15-170783436
161
17410338674
184780783
19-893871738
2078126
211800262812
22-19487170
23-3404825446
24-2186
256103593751
2662748518
27-10455572420
28-823542

[1,1,-2186,1,78126,-2186,-823542,1,4780783,78126,
 -19487170,-2186,62748518,-823542,-170783436,1,
 410338674,4780783,-893871738,78126,1800262812,
 -19487170,-3404825446,-2186,6103593751,62748518,
 -10455572420,-823542]