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A357446 as a simple table

na(n)
20
30
40
52
65
734
8212
91614
1014059
11144712
121726497
1323550891
14361098825
156137247735

[0,0,0,2,5,34,212,1614,14059,144712,1726497,
 23550891,361098825,6137247735]