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A174792 as a simple table

na(n)
00
11
21
3-7
4-15
533
6145
7-71
8-1119
9-767
107137
1113625
12-35567
13-138079
1497265
151099385
16556609
17-7236351
18-12231999
1937865849
20130726193
21-122102751
22-1075051951
23-351058887
247296407521
2510828871681
26-39894922079
27-122993431367
28145442151505
291046291093153

[0,1,1,-7,-15,33,145,-71,-1119,-767,7137,13625,
 -35567,-138079,97265,1099385,556609,-7236351,
 -12231999,37865849,130726193,-122102751,
 -1075051951,-351058887,7296407521,10828871681,
 -39894922079,-122993431367,145442151505,
 1046291093153]