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A077920 as a simple table

na(n)
01
1-1
24
3-7
418
5-38
688
7-195
8441
9-988
102223
11-4992
1211220
13-25208
1456645
15-127277
16285992
17-642615
181443946
19-3244514
207290360
21-16381287
2236808421
23-82707768
24185842671
25-417584688
26938304280
27-2108350576
284737420745
29-10644887785
3023918845740
31-53745158519
32120764274994

[1,-1,4,-7,18,-38,88,-195,441,-988,2223,-4992,
 11220,-25208,56645,-127277,285992,-642615,1443946,
 -3244514,7290360,-16381287,36808421,-82707768,
 185842671,-417584688,938304280,-2108350576,
 4737420745,-10644887785,23918845740,-53745158519,
 120764274994]