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A240986 as a simple table

na(n)
13
26
3-36
4-216
51296
6-5184
7-145152
8-3856896
9-170325504
10-6133211136
111094593056768
1226742290558976
13-497681937801216
14-14357497419546624
15657148066947072000
1612008320398059765760
171322255096225695531008
1870546799432003423698944
19-6537119853797882157072384
20-27940593871362459110473728

[3,6,-36,-216,1296,-5184,-145152,-3856896,
 -170325504,-6133211136,1094593056768,
 26742290558976,-497681937801216,
 -14357497419546624,657148066947072000,
 12008320398059765760,1322255096225695531008,
 70546799432003423698944,
 -6537119853797882157072384,
 -27940593871362459110473728]