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A098494 as a simple table

na(n)
01
11
2-1
31
4-5
54
61
7-12
835
9-30
101
11-22
12143
13-362
14312
151
16-35
17405
18-2065
194814
20-4200
211
22-51
23925
24-7965
2535434
26-78744
2769120
281
29-70
301834
31-24010
32173929
33-709240
341525236
35-1345680
361
37-92
383290
39-61040
40655529
41-4235588
4216255420
43-34148400
4430240000

[1,1,-1,1,-5,4,1,-12,35,-30,1,-22,143,-362,312,1,
 -35,405,-2065,4814,-4200,1,-51,925,-7965,35434,
 -78744,69120,1,-70,1834,-24010,173929,-709240,
 1525236,-1345680,1,-92,3290,-61040,655529,
 -4235588,16255420,-34148400,30240000]