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A258941 as a simple table

na(n)
01
1-7
241
3-253
41555
5-9532
658463
7-358600
82199546
9-13491360
1082752059
11-507576937
123113328401
13-19096245457
14117130782240
15-718445946527
164406737223117
17-27029636742811
18165791883077354
19-1016918901125280
206237482995373629
21-38258895644996020

[1,-7,41,-253,1555,-9532,58463,-358600,2199546,
 -13491360,82752059,-507576937,3113328401,
 -19096245457,117130782240,-718445946527,
 4406737223117,-27029636742811,165791883077354,
 -1016918901125280,6237482995373629,
 -38258895644996020]