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A001938 as a simple table

na(n)
01
1-4
214
3-40
4101
5-236
6518
7-1080
82162
9-4180
107840
11-14328
1225591
13-44776
1476918
15-129952
16216240
17-354864
18574958
19-920600
201457946
21-2285452
223548550
23-5460592
248332425
25-12614088
2618953310
27-28276968
2841904208
29-61702876
3090304598
31-131399624

[1,-4,14,-40,101,-236,518,-1080,2162,-4180,7840,
 -14328,25591,-44776,76918,-129952,216240,-354864,
 574958,-920600,1457946,-2285452,3548550,-5460592,
 8332425,-12614088,18953310,-28276968,41904208,
 -61702876,90304598,-131399624]