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A009122 as a simple table

na(n)
01
10
21
3-6
441
5-335
63229
7-36036
8457932
9-6534384
10103499016
11-1802302128
1234227784920
13-704076488232
1415595687319640
15-370108332316992
169368461983616128
17-251958336139856448
187174771808983995456

[1,0,1,-6,41,-335,3229,-36036,457932,-6534384,
 103499016,-1802302128,34227784920,-704076488232,
 15595687319640,-370108332316992,9368461983616128,
 -251958336139856448,7174771808983995456]