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A053520 as a simple table

na(n)
02
18
238
374
41522
511986
611838
71054766
811506538
945706526
101772006854
1124681524038
1211169012898
135874202721042
1499515904921182
1566139171377658
163075946152109262
1751924337160029042
184714400135799462226

[2,8,38,74,1522,11986,11838,1054766,11506538,
 45706526,1772006854,24681524038,11169012898,
 5874202721042,99515904921182,66139171377658,
 3075946152109262,51924337160029042,
 4714400135799462226]