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A012577 as a simple table

na(n)
01
10
20
30
4-12
560
6-210
71260
8-11088
978624
10-476520
114469520
12-59173752
13609811488
14-4917756480
1563884751840
16-1229990362368
1716261478914944
18-136911418778304
192226347294914944
20-65132012907161472

[1,0,0,0,-12,60,-210,1260,-11088,78624,-476520,
 4469520,-59173752,609811488,-4917756480,
 63884751840,-1229990362368,16261478914944,
 -136911418778304,2226347294914944,
 -65132012907161472]