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A292831 as a simple table

na(n)
01
1-2
2-2
3-6
4-26
5-134
6-778
7-4950
8-33946
9-248230
10-1921130
11-15650358
12-133644026
13-1192354310
14-11084816458
15-107138260758
16-1074526263898
17-11163814083430
18-119971275641642
19-1331739929195766
20-15250978417105082
21-179975143242023366

[1,-2,-2,-6,-26,-134,-778,-4950,-33946,-248230,
 -1921130,-15650358,-133644026,-1192354310,
 -11084816458,-107138260758,-1074526263898,
 -11163814083430,-119971275641642,
 -1331739929195766,-15250978417105082,
 -179975143242023366]