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A187011 as a simple table

na(n)
10
2-1
312
4-80
51152
6-5632
761440
8-278528
92752512
10-42467328
11182452224
12-2642411520
1323555211264
14-99052683264
15869730877440
16-11828339933184
17158638912045056
18-656820758642688
198683393080360960
20-73742045851680768

[0,-1,12,-80,1152,-5632,61440,-278528,2752512,
 -42467328,182452224,-2642411520,23555211264,
 -99052683264,869730877440,-11828339933184,
 158638912045056,-656820758642688,8683393080360960,
 -73742045851680768]