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A012514 as a simple table

na(n)
00
10
22
3-3
412
5-40
6310
7-2331
822344
9-214992
102290138
11-26031115
12322277780
13-4298532888
1461722080446
15-947673715275
1615499274051408
17-268866053899936
184930878490414002
19-95317757163840915

[0,0,2,-3,12,-40,310,-2331,22344,-214992,2290138,
 -26031115,322277780,-4298532888,61722080446,
 -947673715275,15499274051408,-268866053899936,
 4930878490414002,-95317757163840915]