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A051718 as a simple table

na(n)
01
11
23
31
4-3
5-1
61
71
81
9-5
10-1017
11691
12601
13-7
14-809
153617
16922191
17-43867
18-6132631
19174611
2012988703
21-854513
22-1552922421
23236364091
241139644561
25-8553103
26-7089687053
2723749461029
28378639019356093
29-8615841276005

[1,1,3,1,-3,-1,1,1,1,-5,-1017,691,601,-7,-809,
 3617,922191,-43867,-6132631,174611,12988703,
 -854513,-1552922421,236364091,1139644561,-8553103,
 -7089687053,23749461029,378639019356093,
 -8615841276005]