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A147597 as a simple table

na(n)
11
27
331
4119
5455
61799
77175
828679
9114695
10458759
111835015
127340039
1329360135
14117440519
15469762055
161879048199
177516192775
1830064771079
19120259084295
20481036337159
211924145348615
227696581394439
2330786325577735
24123145302310919
25492581209243655

[1,7,31,119,455,1799,7175,28679,114695,458759,
 1835015,7340039,29360135,117440519,469762055,
 1879048199,7516192775,30064771079,120259084295,
 481036337159,1924145348615,7696581394439,
 30786325577735,123145302310919,492581209243655]