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A025171 as a simple table

na(n)
01
1-2
2-12
356
480
5-1056
6832
715232
8-43776
9-156160
101012736
11473088
12-17149952
1326730496
14220938240
15-869564416
16-1795883008
1717504796672
18-6275465216
19-267525816320
20635459076096
213009494908928
22-16186335035392
23-15779248472064
24290539857510400

[1,-2,-12,56,80,-1056,832,15232,-43776,-156160,
 1012736,473088,-17149952,26730496,220938240,
 -869564416,-1795883008,17504796672,-6275465216,
 -267525816320,635459076096,3009494908928,
 -16186335035392,-15779248472064,290539857510400]