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A004403 as a simple table

na(n)
01
1-4
212
3-32
476
5-168
6352
7-704
81356
9-2532
104600
11-8160
1214176
13-24168
1440512
15-66880
16108876
17-174984
18277932
19-436640
20679032
21-1046016
221597088
23-2418240
243632992
25-5417708
268022840
27-11802176
2817252928
29-25070568
3036223424
31-52053760
3274414412

[1,-4,12,-32,76,-168,352,-704,1356,-2532,4600,
 -8160,14176,-24168,40512,-66880,108876,-174984,
 277932,-436640,679032,-1046016,1597088,-2418240,
 3632992,-5417708,8022840,-11802176,17252928,
 -25070568,36223424,-52053760,74414412]