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A141121 as a simple table

na(n)
11
26
3-180
48640
5-498960
631434480
7-2055943296
8135216506304
9-8720972739072
10538646016002688
11-31024094144060160
121609593032459782656
13-71392972690228672512
142461961564459510280192
15-51302015299696881770496
16-415041229811424576835584

[1,6,-180,8640,-498960,31434480,-2055943296,
 135216506304,-8720972739072,538646016002688,
 -31024094144060160,1609593032459782656,
 -71392972690228672512,2461961564459510280192,
 -51302015299696881770496,
 -415041229811424576835584]