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A078921 as a simple table

na(n)
11
2-1
32
42
5-3
66
7-6
88
9-12
1024
1124
12-30
1340
14-60
15120
16-120
17144
18-180
19240
20-360
21720
22720
23-840
241008
25-1260
261680
27-2520
285040
29-5040
305760
31-6720
328064
33-10080
3413440
35-20160
3640320
3740320
38-45360
3951840
40-60480
4172576
42-90720
43120960
44-181440
45362880
46-362880
47403200
48-453600
49518400
50-604800

[1,-1,2,2,-3,6,-6,8,-12,24,24,-30,40,-60,120,-120,
 144,-180,240,-360,720,720,-840,1008,-1260,1680,
 -2520,5040,-5040,5760,-6720,8064,-10080,13440,
 -20160,40320,40320,-45360,51840,-60480,72576,
 -90720,120960,-181440,362880,-362880,403200,
 -453600,518400,-604800]