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A252138 as a simple table

na(n)
13905
224031
3213689
41741344
514105069
6115183261
7937980660
87634089505
962282795715
10507708323758
114135550418633
1233696297343197
13274629581667408
142238121992115213
1518238035152919716
16148617809035821872

[3905,24031,213689,1741344,14105069,115183261,
 937980660,7634089505,62282795715,507708323758,
 4135550418633,33696297343197,274629581667408,
 2238121992115213,18238035152919716,
 148617809035821872]