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A028942 as a simple table

na(n)
10
20
31
43
55
6-14
7-8
869
9435
102065
113612
12-28888
1343355
142616119
1528076979
16-332513754
17-331948240
188280062505
19641260644409
2018784454671297
21318128427505160
22-10663732503571536
23-66316334575107447
248938035295591025771

[0,0,1,3,5,-14,-8,69,435,2065,3612,-28888,43355,
 2616119,28076979,-332513754,-331948240,8280062505,
 641260644409,18784454671297,318128427505160,
 -10663732503571536,-66316334575107447,
 8938035295591025771]