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A149887 as a simple table

na(n)
01
12
25
314
445
5152
6535
71943
87289
927876
10108448
11428477
121716434
136947541
1428393225
15117079643
16486515806
172034989189
188565051207
1936256323523
20154246683731
21659219337990
222829613175204
2312193980235432
2452737388566862
25228850945637483
26996246088634899
274349589171641900

[1,2,5,14,45,152,535,1943,7289,27876,108448,
 428477,1716434,6947541,28393225,117079643,
 486515806,2034989189,8565051207,36256323523,
 154246683731,659219337990,2829613175204,
 12193980235432,52737388566862,228850945637483,
 996246088634899,4349589171641900]