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A261567 as a simple table

na(n)
01
1-3
23
3-18
469
5-168
6504
7-1578
84800
9-14310
1042396
11-128049
12385839
13-1154271
143458847
15-10386477
1631173873
17-93490386
18280426833
19-841384614
202524300014
21-7572585150
2222717270491
23-68152872885
24204460229394
25-613377236379
261840126774737
27-5520391488054

[1,-3,3,-18,69,-168,504,-1578,4800,-14310,42396,
 -128049,385839,-1154271,3458847,-10386477,
 31173873,-93490386,280426833,-841384614,
 2524300014,-7572585150,22717270491,-68152872885,
 204460229394,-613377236379,1840126774737,
 -5520391488054]