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A099364 as a simple table

na(n)
01
1-2
22
3-4
45
5-10
614
7-28
842
9-84
10132
11-264
12429
13-858
141430
15-2860
164862
17-9724
1816796
19-33592
2058786
21-117572
22208012
23-416024
24742900
25-1485800
262674440
27-5348880
289694845
29-19389690
3035357670
31-70715340
32129644790
33-259289580
34477638700
35-955277400
361767263190
37-3534526380

[1,-2,2,-4,5,-10,14,-28,42,-84,132,-264,429,-858,
 1430,-2860,4862,-9724,16796,-33592,58786,-117572,
 208012,-416024,742900,-1485800,2674440,-5348880,
 9694845,-19389690,35357670,-70715340,129644790,
 -259289580,477638700,-955277400,1767263190,
 -3534526380]