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A252681 as a simple table

na(n)
1750
2630
31005
41525
53185
66645
710933
824685
954782
1091577
11211344
12479362
13805863
141878870
154316287
167281075
1717071625
1839565761
1966917777
20157482493
21367387630
22622655713
231469264172
243444892538
255848122279
2613827395422

[750,630,1005,1525,3185,6645,10933,24685,54782,
 91577,211344,479362,805863,1878870,4316287,
 7281075,17071625,39565761,66917777,157482493,
 367387630,622655713,1469264172,3444892538,
 5848122279,13827395422]