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A186254 as a simple table

na(n)
15
217
353
4149
5449
61289
73761
811261
933773
10101117
11302681
12907757
132723069
148169137
1524506597
1673519793
17220559369
18661677761
191985001917
205955003077
2117865008333
2253595020201
23160785060361
24482355180761
251447065541373
264341196624109
2713023589872329

[5,17,53,149,449,1289,3761,11261,33773,101117,
 302681,907757,2723069,8169137,24506597,73519793,
 220559369,661677761,1985001917,5955003077,
 17865008333,53595020201,160785060361,482355180761,
 1447065541373,4341196624109,13023589872329]