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A009663 as a simple table

na(n)
01
14
212
3-128
4-5232
5-54848
65325504
7403442176
8558723328
9-2994514283520
10-295655443772416
1117110494845845504
129628494110111469568
13971219320278689300480
14-262986198032101769035776

[1,4,12,-128,-5232,-54848,5325504,403442176,
 558723328,-2994514283520,-295655443772416,
 17110494845845504,9628494110111469568,
 971219320278689300480,-262986198032101769035776]