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A176953 as a simple table

na(n)
01
11
2-1
3-5
4-17
5-49
6-129
7-305
8-609
9-801
10735
1110911
1253983
13203551
14651487
151796639
164084447
176188831
18-4060449
19-84814049
20-455815457
21-1824908513
22-6141218081
23-17711864033
24-42059573537
25-67468774625
2633608030943

[1,1,-1,-5,-17,-49,-129,-305,-609,-801,735,10911,
 53983,203551,651487,1796639,4084447,6188831,
 -4060449,-84814049,-455815457,-1824908513,
 -6141218081,-17711864033,-42059573537,
 -67468774625,33608030943]