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A369120 as a simple table

na(n)
0-1
11
2-1
310
4-21
51050
6-45606
76306300
8-32585553
95332033850
10-646674981498
11248655336029100
12-579463114572870
13400708622091878100
14-31790012531476579380
1543435207772044760997000
16-31514892593265599765292045
17814247185935070977732893250

[-1,1,-1,10,-21,1050,-45606,6306300,-32585553,
 5332033850,-646674981498,248655336029100,
 -579463114572870,400708622091878100,
 -31790012531476579380,43435207772044760997000,
 -31514892593265599765292045,
 814247185935070977732893250]