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A108931 as a simple table

na(n)
00
11
2-3
38
4-18
547
6-105
7274
8-612
91597
10-3567
119308
12-20790
1354251
14-121173
15316198
16-706248
171842937
18-4116315
1910741424
20-23991642
2162605607
22-139833537
23364892218
24-815009580
252126747701
26-4750223943
2712395593988
28-27686334078
2972246816227

[0,1,-3,8,-18,47,-105,274,-612,1597,-3567,9308,
 -20790,54251,-121173,316198,-706248,1842937,
 -4116315,10741424,-23991642,62605607,-139833537,
 364892218,-815009580,2126747701,-4750223943,
 12395593988,-27686334078,72246816227]