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A174297 as a simple table

na(n)
01
1-1
2-1
30
4-1
51
6-3
76
8-15
936
10-91
11232
12-603
131585
14-4213
1511298
16-30537
1783097
18-227475
19625992
20-1730787
214805595
22-13393689
2337458330
24-105089229
25295673994
26-834086421
272358641376
28-6684761125
2918985057351
30-54022715451

[1,-1,-1,0,-1,1,-3,6,-15,36,-91,232,-603,1585,
 -4213,11298,-30537,83097,-227475,625992,-1730787,
 4805595,-13393689,37458330,-105089229,295673994,
 -834086421,2358641376,-6684761125,18985057351,
 -54022715451]