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A012802 as a simple table

na(n)
01
10
220
3-784
426256
5-4466176
6435729216
7-104111460608
823261262303488
9-7794968497086464
102988775301503636480
11-1434421552426973564928
12811112609409475303936000
13-540598484103424258178285568

[1,0,20,-784,26256,-4466176,435729216,
 -104111460608,23261262303488,-7794968497086464,
 2988775301503636480,-1434421552426973564928,
 811112609409475303936000,
 -540598484103424258178285568]