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A228767 as a simple table

na(n)
1-2
2-9
3-45
4-231
5-1161
6-5643
7-26637
8-122895
9-557073
10-2490387
11-11010069
12-48234519
13-209715225
14-905969691
15-3892314141
16-16642998303
17-70866960417
18-300647710755
19-1271310319653
20-5360119185447
21-22539988369449
22-94557999988779
23-395824185999405

[-2,-9,-45,-231,-1161,-5643,-26637,-122895,
 -557073,-2490387,-11010069,-48234519,-209715225,
 -905969691,-3892314141,-16642998303,-70866960417,
 -300647710755,-1271310319653,-5360119185447,
 -22539988369449,-94557999988779,-395824185999405]