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A013342 as a simple table

na(n)
01
10
20
3-2
40
5-8
640
7-226
8896
9-13264
1062304
11-1040866
126528896
13-128181272
14950205568
15-21880956098
16189104984064
17-4957876255136
1848968006626816
19-1441276692392770
2016013733248841728
21-522786344819213608

[1,0,0,-2,0,-8,40,-226,896,-13264,62304,-1040866,
 6528896,-128181272,950205568,-21880956098,
 189104984064,-4957876255136,48968006626816,
 -1441276692392770,16013733248841728,
 -522786344819213608]