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A220449 as a simple table

na(n)
11
21
3-10
410
5190
6-730
7-6620
855900
9365300
10-5864300
11-28269800
12839594600
132691559000
14-159300557000
15-238131478000
1638894192662000
17-15194495654000
18-11911522255750000
1929697351895900000
204477959179352100000
21-21683886333440500000
22-2029107997508660900000
2315145164178973569000000

[1,1,-10,10,190,-730,-6620,55900,365300,-5864300,
 -28269800,839594600,2691559000,-159300557000,
 -238131478000,38894192662000,-15194495654000,
 -11911522255750000,29697351895900000,
 4477959179352100000,-21683886333440500000,
 -2029107997508660900000,15145164178973569000000]