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A325730 as a simple table

na(n)
10
21
3-2
44
5-8
616
7-31
856
9-91
10126
11-126
120
13462
14-1715
154704
16-11319
1725186
18-52920
19105840
20-201684
21364609
22-618772
23964173
24-1309574
251309574
261
27-4970097
2818874639
29-52835258
30129107566
31-290081057
32612479308
33-1227418279
342343572690
35-4261482736

[0,1,-2,4,-8,16,-31,56,-91,126,-126,0,462,-1715,
 4704,-11319,25186,-52920,105840,-201684,364609,
 -618772,964173,-1309574,1309574,1,-4970097,
 18874639,-52835258,129107566,-290081057,612479308,
 -1227418279,2343572690,-4261482736]