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A009231 as a simple table

na(n)
01
10
22
3-3
424
5-100
6760
7-5271
846424
9-430704
104535458
11-51583675
12641139356
13-8578689912
14123397966718
15-1895969179755
1631013379835728
17-537961001417760
189865047642312306
19-190684789616229651
203875088566364987868

[1,0,2,-3,24,-100,760,-5271,46424,-430704,4535458,
 -51583675,641139356,-8578689912,123397966718,
 -1895969179755,31013379835728,-537961001417760,
 9865047642312306,-190684789616229651,
 3875088566364987868]