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A186246 as a simple table

na(n)
0-1
12
2-24
3720
4-40320
53628800
6-479001600
787178291200
8-20922789888000
96402373705728000
10-2432902008176640000
111124000727777607680000
12-620448401733239439360000
13403291461126605635584000000
14-304888344611713860501504000000
15265252859812191058636308480000000

[-1,2,-24,720,-40320,3628800,-479001600,
 87178291200,-20922789888000,6402373705728000,
 -2432902008176640000,1124000727777607680000,
 -620448401733239439360000,
 403291461126605635584000000,
 -304888344611713860501504000000,
 265252859812191058636308480000000]