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A274721 as a simple table

na(n)
11
27
357
4182
52057
61068
732318
8110443
9280182
103626068
1123157318
12120813568
13123327057
141097376068
1511109655182
1649925501068
17407838170807
18355101282318
193459595983307
2015613890344818
21365855836217682
22110981321985443
232273204469030182
249647724486047943

[1,7,57,182,2057,1068,32318,110443,280182,3626068,
 23157318,120813568,123327057,1097376068,
 11109655182,49925501068,407838170807,355101282318,
 3459595983307,15613890344818,365855836217682,
 110981321985443,2273204469030182,9647724486047943]