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A079902 as a simple table

na(n)
01
10
24
3-4
412
5-20
640
7-68
8124
9-208
10352
11-580
12944
13-1508
142392
15-3732
165772
17-8836
1813396
19-20132
2030024
21-44412
2265240
23-95188
24137984
25-198808
26284816
27-405764
28575072
29-810980
301138184
31-1590132
322211868
33-3063740
344226640
35-5808372
367952204
37-10848196
3814747560

[1,0,4,-4,12,-20,40,-68,124,-208,352,-580,944,
 -1508,2392,-3732,5772,-8836,13396,-20132,30024,
 -44412,65240,-95188,137984,-198808,284816,-405764,
 575072,-810980,1138184,-1590132,2211868,-3063740,
 4226640,-5808372,7952204,-10848196,14747560]