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A013305 as a simple table

na(n)
00
11
21
3-1
4-1
5-5
6503
7521
8-13
9-827
10-1812469
1144303839
129150959
1317949817
14-17645163013
15-256103154817
16128934425819
17869866425977
187718787745279031
19-657691477236554437
20-23770118746323659
219983376979312685189
2215480320293784856319969
23240884767523727873137
24-3694316464734123751573
25-12325434071961822974423

[0,1,1,-1,-1,-5,503,521,-13,-827,-1812469,
 44303839,9150959,17949817,-17645163013,
 -256103154817,128934425819,869866425977,
 7718787745279031,-657691477236554437,
 -23770118746323659,9983376979312685189,
 15480320293784856319969,240884767523727873137,
 -3694316464734123751573,-12325434071961822974423]