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A127144 as a simple table

na(n)
01
11
20
3-3
4-4
515
648
7-105
8-624
9945
109600
11-10395
12-175680
13135135
143790080
15-2027025
16-95235840
1734459425
182752081920
19-654729075
20-90328089600
2113749310575
223328103116800
23-316234143225
24-136191650918400
257905853580625
266131573025177600
27-213458046676875
28-301213549769932800

[1,1,0,-3,-4,15,48,-105,-624,945,9600,-10395,
 -175680,135135,3790080,-2027025,-95235840,
 34459425,2752081920,-654729075,-90328089600,
 13749310575,3328103116800,-316234143225,
 -136191650918400,7905853580625,6131573025177600,
 -213458046676875,-301213549769932800]