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A189878 as a simple table

na(n)
11
20
30
42
510
64
728
820
956
1072
11200
12644
132940
149152
1539200
16166100
17739924
183586840
1918640500
20107580592
21547737844
223080550788

[1,0,0,2,10,4,28,20,56,72,200,644,2940,9152,39200,
 166100,739924,3586840,18640500,107580592,
 547737844,3080550788]