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A012289 as a simple table

na(n)
01
10
20
30
4-12
560
6-210
71260
8-1680
9-66528
10854040
11-9944880
12101761704
13-561845856
14-2175945408
15136635189600
16-3242837295360
1753779020559744
18-655909940939712
194733948121328512
2061668138518505088

[1,0,0,0,-12,60,-210,1260,-1680,-66528,854040,
 -9944880,101761704,-561845856,-2175945408,
 136635189600,-3242837295360,53779020559744,
 -655909940939712,4733948121328512,
 61668138518505088]