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A325666 as a simple table

na(n)
11
21
3-1
40
53
6-9
719
8-35
963
10-119
11239
12-495
131023
14-2079
154158
16-8239
1716247
18-31823
1961402
20-115291
21207669
22-352715
23550429
24-748143
25748143
261
27-2848367
2810897033
29-30955333
3077558760
31-181129041
32404458737
33-875889377
341855921144
35-3870685665

[1,1,-1,0,3,-9,19,-35,63,-119,239,-495,1023,-2079,
 4158,-8239,16247,-31823,61402,-115291,207669,
 -352715,550429,-748143,748143,1,-2848367,10897033,
 -30955333,77558760,-181129041,404458737,
 -875889377,1855921144,-3870685665]