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A260306 as a simple table

na(n)
01
14
2-8
3-16
48992
5334144
6-698752
7-23349012224
81357305243136
96319924923392
10-8773495082018816
11-49004477022654464
121709650943378038784
13480380831834367035260928
14-88481173388026066736939008
15-660883915180095254454665216
16888962079683152174584309088256

[1,4,-8,-16,8992,334144,-698752,-23349012224,
 1357305243136,6319924923392,-8773495082018816,
 -49004477022654464,1709650943378038784,
 480380831834367035260928,
 -88481173388026066736939008,
 -660883915180095254454665216,
 888962079683152174584309088256]