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A149921 as a simple table

na(n)
01
12
25
315
447
5158
6546
71959
87186
926752
10101598
11390218
121515442
135942431
1423505016
1593645233
16375351768
171514057193
186138079032
1924996491647
20102243003319
21419849010522
221730025591625
237151698005385
2429656218739201
25123313206841880
26514038736373565
272148049283949433
288996338290624829

[1,2,5,15,47,158,546,1959,7186,26752,101598,
 390218,1515442,5942431,23505016,93645233,
 375351768,1514057193,6138079032,24996491647,
 102243003319,419849010522,1730025591625,
 7151698005385,29656218739201,123313206841880,
 514038736373565,2148049283949433,8996338290624829]