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A280690 as a simple table

na(n)
11
21
32
43
55
64
713
87
917
1011
1189
1218
13233
1429
15122
1647
171597
1876
194181
20123
21842
22199
2328657
24322
2515005
26521
275777
28843
29514229
301364
311346269
322207
3339602
343571
35709805
365778
3724157817
389349
39271442
4015127
41165580141
4224476
43433494437
4439603
451860497
4664079
472971215073
48103682
49598364773
50167761
5112752042
52271443

[1,1,2,3,5,4,13,7,17,11,89,18,233,29,122,47,1597,
 76,4181,123,842,199,28657,322,15005,521,5777,843,
 514229,1364,1346269,2207,39602,3571,709805,5778,
 24157817,9349,271442,15127,165580141,24476,
 433494437,39603,1860497,64079,2971215073,103682,
 598364773,167761,12752042,271443]