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A118770 as a simple table

na(n)
14
2-14
3-196
4480
5696
6-57901
7-525364
8-409579
918528507
10-237549252
11-2119519900
126713972874
1318262155072
14-19072020914992
15162234208372185
161471912942112734
176828673030820538
18-35126752028893500
19729026655790306778
20-15365360727898374618

[4,-14,-196,480,696,-57901,-525364,-409579,
 18528507,-237549252,-2119519900,6713972874,
 18262155072,-19072020914992,162234208372185,
 1471912942112734,6828673030820538,
 -35126752028893500,729026655790306778,
 -15365360727898374618]