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A012889 as a simple table

na(n)
00
12
2-1
317
4-54
5677
6-4950
765145
8-752024
911468069
10-176381640
113165529275
12-59818647768
131251370749059
14-27828301203248
15668331142030125
16-17039769301121760
17462939633071828473
18-13293952511690952000

[0,2,-1,17,-54,677,-4950,65145,-752024,11468069,
 -176381640,3165529275,-59818647768,1251370749059,
 -27828301203248,668331142030125,
 -17039769301121760,462939633071828473,
 -13293952511690952000]