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A305487 as a simple table

na(n)
15
2157
3295
4125
57007
623229
752124
8581383
92463954
108570618
1156143574
12267901337
131116868133
146024191561
1529624539835
16134241410418
17674874922277
183322616624721
1915652901052092
2076798796724976
21376381323915795

[5,157,295,125,7007,23229,52124,581383,2463954,
 8570618,56143574,267901337,1116868133,6024191561,
 29624539835,134241410418,674874922277,
 3322616624721,15652901052092,76798796724976,
 376381323915795]