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A115344 as a simple table

na(n)
0-1
11
2-1
33
4-6
518
6-45
7136
8-378
91156
10-3405
1110549
12-32175
13100915
14-314834
15998323
16-3163683
1710127020
18-32462265
19104751043
20-338742887
211100559573
22-3583933846
2311711868458
24-38358103030
25125974533997
26-414566089320
271367353737806
28-4518185596293

[-1,1,-1,3,-6,18,-45,136,-378,1156,-3405,10549,
 -32175,100915,-314834,998323,-3163683,10127020,
 -32462265,104751043,-338742887,1100559573,
 -3583933846,11711868458,-38358103030,125974533997,
 -414566089320,1367353737806,-4518185596293]