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A318259 as a simple table

na(n)
01
1-1
21
35
4-11
56
6-61
7211
8-240
990
101385
11-6551
1211466
13-8820
142520
15-50521
16303271
17-719580
18844830
19-491400
20113400
212702765
22-19665491
2358998126
24-93511440
2582661040
26-38669400
277484400
28-199360981
291704396331
30-6187282920
3112372329970
32-14727913200
3310443232800
34-4086482400
35681080400

[1,-1,1,5,-11,6,-61,211,-240,90,1385,-6551,11466,
 -8820,2520,-50521,303271,-719580,844830,-491400,
 113400,2702765,-19665491,58998126,-93511440,
 82661040,-38669400,7484400,-199360981,1704396331,
 -6187282920,12372329970,-14727913200,10443232800,
 -4086482400,681080400]