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A149987 as a simple table

na(n)
01
12
25
317
457
5197
6727
72749
810399
940301
10159574
11631160
122522298
1310221848
1441531613
15169372736
16696855374
172879429468
1811915981127
1949573590322
20207133252404
21866652990044
223636829064055
2315317311427914
2464620435352636
25273084047111032
261157214293358466
274912795094807380

[1,2,5,17,57,197,727,2749,10399,40301,159574,
 631160,2522298,10221848,41531613,169372736,
 696855374,2879429468,11915981127,49573590322,
 207133252404,866652990044,3636829064055,
 15317311427914,64620435352636,273084047111032,
 1157214293358466,4912795094807380]