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A325741 as a simple table

na(n)
11
21
3-2
44
5-8
616
7-32
864
9-127
10246
11-456
12792
13-1254
141716
15-1716
161
176418
18-24156
1967080
20-162924
21364608
22-767976
231535953
24-2922702
255273624
26-8934120
2713904190
28-18874260
2918874260
301
31-71705866
32272491892
33-763189064
341865459352
35-4190875872

[1,1,-2,4,-8,16,-32,64,-127,246,-456,792,-1254,
 1716,-1716,1,6418,-24156,67080,-162924,364608,
 -767976,1535953,-2922702,5273624,-8934120,
 13904190,-18874260,18874260,1,-71705866,272491892,
 -763189064,1865459352,-4190875872]