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A288743 as a simple table

na(n)
21
31
47
518
659
7193
8616
91955
106244
1119926
1263490
13202068
14642816
152044571
166502193
1720673020
1865714586
19208870774
20663868055
212109997964
226706282384
2321315049217
2467748772174
25215343287489
26684507346839
272175916952697
286917096914771
2921989855308501

[1,1,7,18,59,193,616,1955,6244,19926,63490,202068,
 642816,2044571,6502193,20673020,65714586,
 208870774,663868055,2109997964,6706282384,
 21315049217,67748772174,215343287489,684507346839,
 2175916952697,6917096914771,21989855308501]