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A084219 as a simple table

na(n)
01
1-1
24
3-8
420
5-44
6100
7-220
8484
9-1052
102276
11-4892
1210468
13-22300
1447332
15-100124
16211172
17-444188
18932068
19-1951516
204077796
21-8505116
2217709284
23-36816668
2476429540
25-158451484
26328087780
27-678545180
281401829604

[1,-1,4,-8,20,-44,100,-220,484,-1052,2276,-4892,
 10468,-22300,47332,-100124,211172,-444188,932068,
 -1951516,4077796,-8505116,17709284,-36816668,
 76429540,-158451484,328087780,-678545180,
 1401829604]