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A038070 as a simple table

na(n)
15
2-10
340
4-160
5624
6-2580
711160
8-48910
9217000
10-976248
114438920
12-20346280
1393900240
14-435959820
152034504992
16-9536767660
1744878791360
18-211927516500
191003867701480
20-4768372069968
2122706531339280
22-108372079190340
23518301258916440
24-2483526875798780

[5,-10,40,-160,624,-2580,11160,-48910,217000,
 -976248,4438920,-20346280,93900240,-435959820,
 2034504992,-9536767660,44878791360,-211927516500,
 1003867701480,-4768372069968,22706531339280,
 -108372079190340,518301258916440,
 -2483526875798780]