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A344820 as a simple table

na(n)
11
20
39
4-52
5520
6-6636
7102984
8-1864600
938741463
10-909081740
1123775986069
12-685854111804
1321633935838489
14-740800448012044
1527368368159530285
16-1085102592823737200
1745957792326631241516
18-2070863582899905915336
1998920982783031811482920
20-4993219047619535240997780

[1,0,9,-52,520,-6636,102984,-1864600,38741463,
 -909081740,23775986069,-685854111804,
 21633935838489,-740800448012044,27368368159530285,
 -1085102592823737200,45957792326631241516,
 -2070863582899905915336,98920982783031811482920,
 -4993219047619535240997780]