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A173296 as a simple table

na(n)
01
1-4
228
3-96
41328
5-4672
633472
7-121856
83597056
9-13417472
1033655808
11-127508480
125829259264
13-22308732928
14171393728512
15-660468137984
1640831182635008
17-22589996269568
18175323994652672
19-681560447647744

[1,-4,28,-96,1328,-4672,33472,-121856,3597056,
 -13417472,33655808,-127508480,5829259264,
 -22308732928,171393728512,-660468137984,
 40831182635008,-22589996269568,175323994652672,
 -681560447647744]