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A084244 as a simple table

na(n)
01
15
2-15
345
4-135
5405
6-1215
73645
8-10935
932805
10-98415
11295245
12-885735
132657205
14-7971615
1523914845
16-71744535
17215233605
18-645700815
191937102445
20-5811307335
2117433922005
22-52301766015
23156905298045
24-470715894135
251412147682405
26-4236443047215

[1,5,-15,45,-135,405,-1215,3645,-10935,32805,
 -98415,295245,-885735,2657205,-7971615,23914845,
 -71744535,215233605,-645700815,1937102445,
 -5811307335,17433922005,-52301766015,156905298045,
 -470715894135,1412147682405,-4236443047215]