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A101851 as a simple table

na(n)
00
11
21
3-2
4-1
511
6-18
7-41
8317
9-680
10-1767
1119911
12-68264
13-59643
142076973
15-11905466
1618577387
17269836343
18-2819431570
1912357816867
2017355428041
21-752675321800
226318046208653
23-21416130683133
24-152569023028272
253016508107668601
26-23667435182395287

[0,1,1,-2,-1,11,-18,-41,317,-680,-1767,19911,
 -68264,-59643,2076973,-11905466,18577387,
 269836343,-2819431570,12357816867,17355428041,
 -752675321800,6318046208653,-21416130683133,
 -152569023028272,3016508107668601,
 -23667435182395287]