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A123183 as a simple table

na(n)
1-1
2-1
3-2
4-5
5-14
6-41
7-122
8-365
9-1094
10-3281
11-9842
12-29525
13-88574
14-265721
15-797162
16-2391485
17-7174454
18-21523361
19-64570082
20-193710245
21-581130734
22-1743392201
23-5230176602
24-15690529805
25-47071589414
26-141214768241
27-423644304722
28-1270932914165
29-3812798742494

[-1,-1,-2,-5,-14,-41,-122,-365,-1094,-3281,-9842,
 -29525,-88574,-265721,-797162,-2391485,-7174454,
 -21523361,-64570082,-193710245,-581130734,
 -1743392201,-5230176602,-15690529805,-47071589414,
 -141214768241,-423644304722,-1270932914165,
 -3812798742494]