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A161909 as a simple table

na(n)
00
10
21
3-3
47
5-13
623
7-41
879
9-161
10335
11-689
121391
13-2769
145487
15-10897
1621743
17-43537
1887279
19-174865
20349935
21-699665
221398511
23-2795793
245590767
25-11182353
2622367983
27-44740881
2889485039
29-178966801
30357920495
31-715821329
321431629551
33-2863272209
345726596847

[0,0,1,-3,7,-13,23,-41,79,-161,335,-689,1391,
 -2769,5487,-10897,21743,-43537,87279,-174865,
 349935,-699665,1398511,-2795793,5590767,-11182353,
 22367983,-44740881,89485039,-178966801,357920495,
 -715821329,1431629551,-2863272209,5726596847]