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A249520 as a simple table

na(n)
01
15
217
3134
41333
514890
6178394
72240268
829101197
9387793090
105271628846
1172818272852
121019157450818
1314421479205284
14205978607191508
152965567162041368
1642994130150806077
17627124332791860146
189196734644381065510
19135516564162069215748
202005456310676742385910

[1,5,17,134,1333,14890,178394,2240268,29101197,
 387793090,5271628846,72818272852,1019157450818,
 14421479205284,205978607191508,2965567162041368,
 42994130150806077,627124332791860146,
 9196734644381065510,135516564162069215748,
 2005456310676742385910]