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A273955 as a simple table

na(n)
11
21
3-1
42
5-4
612
7-36
8115
9-366
101202
11-4016
1213684
13-47192
14164550
15-578773
162051994
17-7324990
1826306860
19-94980720
20344555898
21-1255235744
224590432218
23-16845658552
2462014596756
25-228956736888
26847546307549
27-3145089430938
2811697191534690
29-43595085475847
30162793363083734
31-609005952973882
322282129119421879
33-8565364253229324
3432195552437196082
35-121185775973925826
36456749227410641398

[1,1,-1,2,-4,12,-36,115,-366,1202,-4016,13684,
 -47192,164550,-578773,2051994,-7324990,26306860,
 -94980720,344555898,-1255235744,4590432218,
 -16845658552,62014596756,-228956736888,
 847546307549,-3145089430938,11697191534690,
 -43595085475847,162793363083734,-609005952973882,
 2282129119421879,-8565364253229324,
 32195552437196082,-121185775973925826,
 456749227410641398]