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A122100 as a simple table

na(n)
01
1-1
20
3-1
4-2
5-6
6-17
7-49
8-141
9-406
10-1169
11-3366
12-9692
13-27907
14-80355
15-231373
16-666212
17-1918281
18-5523470
19-15904198
20-45794313
21-131859469
22-379674209
23-1093228314
24-3147825473
25-9063802210
26-26098178316
27-75146709475
28-216376326215
29-623030800329
30-1793945691512

[1,-1,0,-1,-2,-6,-17,-49,-141,-406,-1169,-3366,
 -9692,-27907,-80355,-231373,-666212,-1918281,
 -5523470,-15904198,-45794313,-131859469,
 -379674209,-1093228314,-3147825473,-9063802210,
 -26098178316,-75146709475,-216376326215,
 -623030800329,-1793945691512]