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A145978 as a simple table

na(n)
01
11
2-7
3-15
441
5161
6-167
7-1455
8-119
911521
1012473
11-79695
12-179479
13458081
141893913
15-1770735
16-16922039
17-2756159
18132620153
19154669425
20-906291799
21-2143647199
225106687193
2322255864785
24-18597632759
25-196644551039
26-47863488967
271525292919345

[1,1,-7,-15,41,161,-167,-1455,-119,11521,12473,
 -79695,-179479,458081,1893913,-1770735,-16922039,
 -2756159,132620153,154669425,-906291799,
 -2143647199,5106687193,22255864785,-18597632759,
 -196644551039,-47863488967,1525292919345]