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A024236 as a simple table

na(n)
00
11
2-2
348
4-1040
562720
6-4314624
7498003968
8-70081316864
913529482592256
10-3175495421788160
11933402531586899968
12-326784893253162369024
13136568449424117316190208
14-66517446960602151366164480

[0,1,-2,48,-1040,62720,-4314624,498003968,
 -70081316864,13529482592256,-3175495421788160,
 933402531586899968,-326784893253162369024,
 136568449424117316190208,
 -66517446960602151366164480]