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A165405 as a simple table

na(n)
01
13
23
315
43
587
6-69
7591
8-1005
94551
10-10581
1137887
12-101373
13328695
14-936933
152909103
16-8530701
1725985319
18-77169525
19233081439
20-696098589
212094587223
22-6271178757
2318838702095
24-56465774637
25169497987207
26-508292635029

[1,3,3,15,3,87,-69,591,-1005,4551,-10581,37887,
 -101373,328695,-936933,2909103,-8530701,25985319,
 -77169525,233081439,-696098589,2094587223,
 -6271178757,18838702095,-56465774637,169497987207,
 -508292635029]