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A007248 as a simple table

na(n)
01
120
2-62
3216
4-641
51636
6-3778
78248
8-17277
934664
10-66878
11125312
12-229252
13409676
14-716420
151230328
16-2079227
173460416
18-5677816
199198424
20-14729608
2123328520
22-36567242
2356774712
24-87369461
25133321908
26-201825396
27303248408
28-452431503

[1,20,-62,216,-641,1636,-3778,8248,-17277,34664,
 -66878,125312,-229252,409676,-716420,1230328,
 -2079227,3460416,-5677816,9198424,-14729608,
 23328520,-36567242,56774712,-87369461,133321908,
 -201825396,303248408,-452431503]