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A195154 as a simple table

na(n)
11
21
3-2
46
5-30
6184
7-1294
810034
9-83908
10746006
11-6983600
1268360302
13-696122684
147345561204
15-80074813040
16899590031932
17-10394864935860
18123344285904634
19-1500938535372826
2018709376854618500
21-238664936823622052
223113060999816038350

[1,1,-2,6,-30,184,-1294,10034,-83908,746006,
 -6983600,68360302,-696122684,7345561204,
 -80074813040,899590031932,-10394864935860,
 123344285904634,-1500938535372826,
 18709376854618500,-238664936823622052,
 3113060999816038350]