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A371841 as a simple table

na(n)
00
11
21
31
4-35
5325
6-1295
7-12455
8283285
9-2186675
10-5612255
11324564625
12-2869315163
13-12271744331
14490525545169
15-2159646628535
16-58485623789483
17634417586418781
188780962428445537
19-156001827155519807
20-2145519156372933275
2150455156500263955781

[0,1,1,1,-35,325,-1295,-12455,283285,-2186675,
 -5612255,324564625,-2869315163,-12271744331,
 490525545169,-2159646628535,-58485623789483,
 634417586418781,8780962428445537,
 -156001827155519807,-2145519156372933275,
 50455156500263955781]