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A215216 as a simple table

na(n)
01
12
24
3-6
48
5-36
624
716
8-144
9300
10-120
1132
12-480
132040
14-2640
15720
1664
17-1440
1810320
19-27720
2025200
21-5040
22128
23-4032
2443680
25-199920
26383040
27-262080
2840320
29256
30-10752
31163968
32-1142400
333764880
34-5503680
352963520
36-362880

[1,2,4,-6,8,-36,24,16,-144,300,-120,32,-480,2040,
 -2640,720,64,-1440,10320,-27720,25200,-5040,128,
 -4032,43680,-199920,383040,-262080,40320,256,
 -10752,163968,-1142400,3764880,-5503680,2963520,
 -362880]