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A228068 as a simple table

na(n)
1-1
2-3
3-5
4-7
5-21
6-92
7-209
8-415
9-947
10-1403
11-8484
12-26675
13-70708
14-205919
15-737729
16-2162013
17-4741957
18-13992966
19-77928220
20-122866869
21-374649610
22-1334960954
23-5317831008
24-9896721062
25-38014073661

[-1,-3,-5,-7,-21,-92,-209,-415,-947,-1403,-8484,
 -26675,-70708,-205919,-737729,-2162013,-4741957,
 -13992966,-77928220,-122866869,-374649610,
 -1334960954,-5317831008,-9896721062,-38014073661]