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A128056 as a simple table

na(n)
01
1-3
2-6
328
456
5-288
6-576
73008
86016
9-31488
10-62976
11329728
12659456
13-3452928
14-6905856
1536159488
1672318976
17-378667008
18-757334016
193965452288
207930904576
21-41526755328
22-83053510656
23434873827328

[1,-3,-6,28,56,-288,-576,3008,6016,-31488,-62976,
 329728,659456,-3452928,-6905856,36159488,72318976,
 -378667008,-757334016,3965452288,7930904576,
 -41526755328,-83053510656,434873827328]