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A261566 as a simple table

na(n)
01
1-2
20
3-6
416
5-18
648
7-94
8208
9-426
10752
11-1646
123360
13-6578
1413056
15-26358
1653456
17-105890
18211392
19-424366
20850544
21-1699290
223393136
23-6795646
2413601184
25-27188130
2654358000
27-108752870
28217552976
29-435033618
30869999584
31-1740145118
323480497584

[1,-2,0,-6,16,-18,48,-94,208,-426,752,-1646,3360,
 -6578,13056,-26358,53456,-105890,211392,-424366,
 850544,-1699290,3393136,-6795646,13601184,
 -27188130,54358000,-108752870,217552976,
 -435033618,869999584,-1740145118,3480497584]