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A012003 as a simple table

na(n)
01
10
2-3
3-30
4-483
5-12660
6-492063
7-26407290
8-1854592743
9-162954226920
10-17150991170523
11-2051454240374550
12-254425037609483403
13-24186909676571913180
143098088521295623020617

[1,0,-3,-30,-483,-12660,-492063,-26407290,
 -1854592743,-162954226920,-17150991170523,
 -2051454240374550,-254425037609483403,
 -24186909676571913180,3098088521295623020617]