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A138804 as a simple table

na(n)
10
21
32
48
525
677
7236
8721
92198
106698
1120408
1262173
13189414
14577055
151758012
165355828
1716316664
1849709120
19151440064
20461365896
211405562597
224282081163
2313045466011
2439743334364
25121079049617
26168870314746

[0,1,2,8,25,77,236,721,2198,6698,20408,62173,
 189414,577055,1758012,5355828,16316664,49709120,
 151440064,461365896,1405562597,4282081163,
 13045466011,39743334364,121079049617,168870314746]