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A317040 as a simple table

na(n)
18
257
390
4610
56188
635318
7333207
84194626
941147020
10427564765
114921133617
1253673135073
13581177979136
146470772304862
1571529302005742
16785927601982277
178688294337589738
1896049615334637072
191059627092988600390

[8,57,90,610,6188,35318,333207,4194626,41147020,
 427564765,4921133617,53673135073,581177979136,
 6470772304862,71529302005742,785927601982277,
 8688294337589738,96049615334637072,
 1059627092988600390]