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A012583 as a simple table

na(n)
01
10
20
30
4-12
560
6-210
71260
8-4368
9-42336
10833880
11-9944880
12109031208
13-998835552
145256888000
1557628902240
16-2552409700608
1753611141985664
18-880205240332224
1912318269451041664
20-115115298914746752

[1,0,0,0,-12,60,-210,1260,-4368,-42336,833880,
 -9944880,109031208,-998835552,5256888000,
 57628902240,-2552409700608,53611141985664,
 -880205240332224,12318269451041664,
 -115115298914746752]