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A108413 as a simple table

na(n)
01
11
21
3-2
4-5
57
619
7-26
8-71
997
10265
11-362
12-989
131351
143691
15-5042
16-13775
1718817
1851409
19-70226
20-191861
21262087
22716035
23-978122
24-2672279
253650401
269973081
27-13623482
28-37220045
2950843527
30138907099
31-189750626
32-518408351
33708158977
341934726305

[1,1,1,-2,-5,7,19,-26,-71,97,265,-362,-989,1351,
 3691,-5042,-13775,18817,51409,-70226,-191861,
 262087,716035,-978122,-2672279,3650401,9973081,
 -13623482,-37220045,50843527,138907099,-189750626,
 -518408351,708158977,1934726305]