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A013414 as a simple table

na(n)
01
10
20
390
4-2520
5368550
6-24324300
76214858650
8-725350626000
9318282066852750
10-56464293738352500
1140214549353890161250
12-9894502805503110795000
1310823754426851479957593750

[1,0,0,90,-2520,368550,-24324300,6214858650,
 -725350626000,318282066852750,-56464293738352500,
 40214549353890161250,-9894502805503110795000,
 10823754426851479957593750]