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A099784 as a simple table

na(n)
01
1-2
24
3-6
44
516
6-92
7312
8-848
91960
10-3824
115760
12-3824
13-15392
1488384
15-299616
16814144
17-1881344
183669568
19-5524608
203657472
2114807680
22-84909824
23287723520
24-781639424
251805843968
26-3521371136
275298829824

[1,-2,4,-6,4,16,-92,312,-848,1960,-3824,5760,
 -3824,-15392,88384,-299616,814144,-1881344,
 3669568,-5524608,3657472,14807680,-84909824,
 287723520,-781639424,1805843968,-3521371136,
 5298829824]