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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.

A051150 as a simple table

na(n)
11
2-5
31
450
5-15
61
7-750
8275
9-30
101
1115000
12-6250
13875
14-50
151
16-375000
17171250
18-28125
192125
20-75
211
2211250000
23-5512500
241015000
25-91875
264375
27-105
281
29-393750000
30204187500
31-41037500
324230625

[1,-5,1,50,-15,1,-750,275,-30,1,15000,-6250,875,
 -50,1,-375000,171250,-28125,2125,-75,1,11250000,
 -5512500,1015000,-91875,4375,-105,1,-393750000,
 204187500,-41037500,4230625]