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A012841 as a simple table

na(n)
01
14
220
3-1024
4-147568
5-19148736
6-2934842560
7-551525234688
8-127249126657792
9-35789287036394496
10-12158191126869847040
11-4941201795126314303488
12-2379230211581147229286400

[1,4,20,-1024,-147568,-19148736,-2934842560,
 -551525234688,-127249126657792,-35789287036394496,
 -12158191126869847040,-4941201795126314303488,
 -2379230211581147229286400]