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A013415 as a simple table

na(n)
01
10
20
3-90
42520
5-368550
636798300
7-8485126650
81746971226000
9-623950950372750
10216093789514102500
11-111905269600936061250
1258297381976449590975000
13-41488228251938936311593750

[1,0,0,-90,2520,-368550,36798300,-8485126650,
 1746971226000,-623950950372750,216093789514102500,
 -111905269600936061250,58297381976449590975000,
 -41488228251938936311593750]