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A252926 as a simple table

na(n)
10
21
333
4615
56997
653950
7315198
81499394
96083808
1021733215
1169921908
12206052448
13563440284
141444285973
153499040581
168065603025
1717787652381
1837705694442
1977126966988
20152747362302
21293741640632
22549886035657

[0,1,33,615,6997,53950,315198,1499394,6083808,
 21733215,69921908,206052448,563440284,1444285973,
 3499040581,8065603025,17787652381,37705694442,
 77126966988,152747362302,293741640632,
 549886035657]