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A076847 as a simple table

na(n)
1-24
2252
34830
4-16744
5534612
6-577738
7-6905934
810661420
918643272
10128406630
11-52843168
12-182213314
13308120442
14-17125708
152687348496
16-1596055698
17-5189203740
186956478662
19-15481826884
209791485272
211463791322
2238116845680
23-29335099668
24-24992917110

[-24,252,4830,-16744,534612,-577738,-6905934,
 10661420,18643272,128406630,-52843168,-182213314,
 308120442,-17125708,2687348496,-1596055698,
 -5189203740,6956478662,-15481826884,9791485272,
 1463791322,38116845680,-29335099668,-24992917110]