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A268957 as a simple table

na(n)
15
229
3138
4634
53045
615579
785314
8498408
93092383
1020286281
11140153290
121016261974
137710988251
1461062381647
15503482376776
164313580705556
1738328590370571
18352618807558797
193353663977088616
2032927374589861042

[5,29,138,634,3045,15579,85314,498408,3092383,
 20286281,140153290,1016261974,7710988251,
 61062381647,503482376776,4313580705556,
 38328590370571,352618807558797,3353663977088616,
 32927374589861042]