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A218473 as a simple table

na(n)
01
11
27
361
4591
56101
665719
7729933
88297247
996044101
101128138567
1113411861629
12161066465583
131950996039669
1423808159962839
15292413627476141
163611870017079871
1744838216520062117
18559127724970143079
197000374603097246173
2087964883375131331151

[1,1,7,61,591,6101,65719,729933,8297247,96044101,
 1128138567,13411861629,161066465583,1950996039669,
 23808159962839,292413627476141,3611870017079871,
 44838216520062117,559127724970143079,
 7000374603097246173,87964883375131331151]