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A302201 as a simple table

na(n)
01
11
2-7
35
4193
5-1273
6-2707
7118827
8-853551
9-4449558
10165958491
11-1452523488
12-8908621939
13425284211536
14-4941880813097
15-19601696580922
161717461768840017
17-27768623874128015
1811072293576957975
199641864176354481835

[1,1,-7,5,193,-1273,-2707,118827,-853551,-4449558,
 165958491,-1452523488,-8908621939,425284211536,
 -4941880813097,-19601696580922,1717461768840017,
 -27768623874128015,11072293576957975,
 9641864176354481835]