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A277752 as a simple table

na(n)
01
10
22
3-2
44
5-7
610
7-19
827
9-49
1073
11-126
12195
13-326
14516
15-848
161358
17-2213
183564
19-5785
209341
21-15135
2224467
23-39612
2464069
25-103692
26167750
27-271454
28439192
29-710659
301149838
31-1860511
323010335
33-4870861
347881181
35-12752058
3620633223
37-33385298
3854018504
39-87403820
40141422306

[1,0,2,-2,4,-7,10,-19,27,-49,73,-126,195,-326,516,
 -848,1358,-2213,3564,-5785,9341,-15135,24467,
 -39612,64069,-103692,167750,-271454,439192,
 -710659,1149838,-1860511,3010335,-4870861,7881181,
 -12752058,20633223,-33385298,54018504,-87403820,
 141422306]