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A222613 as a simple table

na(n)
15
240
3181
45746
560550
62921905
743650470
82748085305
944499006072
102935039880037
1148422176002273
123217634669353437
1353258617891960804
143541270168065327366
1558695105162011373774
163902182230284175940378

[5,40,181,5746,60550,2921905,43650470,2748085305,
 44499006072,2935039880037,48422176002273,
 3217634669353437,53258617891960804,
 3541270168065327366,58695105162011373774,
 3902182230284175940378]