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A105467 as a simple table

na(n)
10
20
35
422
591
6286
7863
82577
97717
1023160
1169939
12209485
13627826
141881554
155645226
1616936048

[0,0,5,22,91,286,863,2577,7717,23160,69939,209485,
 627826,1881554,5645226,16936048]