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A058756 as a simple table

na(n)
01
1-2
2-2
3-2
4-6
5-10
6-34
7-82
8-254
9-730
10-2238
11-6826
12-21370
13-67122
14-213654
15-684258
16-2208694
17-7169298
18-23402738
19-76748130
20-252790518
21-835816658
22-2773236614
23-9230776706
24-30814377058
25-103139338858
26-346067984622
27-1163810570178

[1,-2,-2,-2,-6,-10,-34,-82,-254,-730,-2238,-6826,
 -21370,-67122,-213654,-684258,-2208694,-7169298,
 -23402738,-76748130,-252790518,-835816658,
 -2773236614,-9230776706,-30814377058,
 -103139338858,-346067984622,-1163810570178]