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A331334 as a simple table

na(n)
01
10
2-4
332
4-240
51792
6-11840
726112
81589504
9-57548800
101556757504
11-39250780160
12973563695104
13-24122607992832
14596246557736960
15-14477682566889472
16332039052050104320
17-6425352382711857152
1853086817854485692416
194505005802471597015040
20-419037805969718712991744

[1,0,-4,32,-240,1792,-11840,26112,1589504,
 -57548800,1556757504,-39250780160,973563695104,
 -24122607992832,596246557736960,
 -14477682566889472,332039052050104320,
 -6425352382711857152,53086817854485692416,
 4505005802471597015040,-419037805969718712991744]