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A009369 as a simple table

na(n)
00
11
2-1
31
4-8
545
6-301
72357
8-21608
9223769
10-2602081
1133484713
12-473210528
137282225093
14-121272163741
152172791685469
16-41680241726768
17852337358029617
18-18510436676621281
19425474580069715025
20-10319766893265298328

[0,1,-1,1,-8,45,-301,2357,-21608,223769,-2602081,
 33484713,-473210528,7282225093,-121272163741,
 2172791685469,-41680241726768,852337358029617,
 -18510436676621281,425474580069715025,
 -10319766893265298328]