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A045873 as a simple table

na(n)
00
11
22
3-1
4-12
5-19
622
7139
8168
9-359
10-1558
11-1321
125148
1316901
148062
15-68381
16-177072
17-12239
18860882
191782959
20-738492
21-10391779
22-17091098
2317776699
24121008888
25153134281
26-298775878
27-1363223161
28-1232566932

[0,1,2,-1,-12,-19,22,139,168,-359,-1558,-1321,
 5148,16901,8062,-68381,-177072,-12239,860882,
 1782959,-738492,-10391779,-17091098,17776699,
 121008888,153134281,-298775878,-1363223161,
 -1232566932]