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A081864 as a simple table

na(n)
11
2244
33126
416808
559293
6161052
7371294
8762744
91419858
102476100
114101152
126436344
139768751
1414408200
1520511150
1628629152
1739296688
1852541808
1969343958
2090595736
21115856202
22147008444
23185349918
24229345008
25282492057
26346445352

[1,244,3126,16808,59293,161052,371294,762744,
 1419858,2476100,4101152,6436344,9768751,14408200,
 20511150,28629152,39296688,52541808,69343958,
 90595736,115856202,147008444,185349918,229345008,
 282492057,346445352]