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A149956 as a simple table

na(n)
01
12
25
316
452
5179
6657
72445
89340
936701
10145628
11586312
122398468
139879421
1441072067
15172514552
16728279781
173094286178
1813241783880
1956885626708
20245535890251
211065461753201
224637394881411
2320257808425487
2488856696223318
25390704372696703
261722913681845064
277622404131695837

[1,2,5,16,52,179,657,2445,9340,36701,145628,
 586312,2398468,9879421,41072067,172514552,
 728279781,3094286178,13241783880,56885626708,
 245535890251,1065461753201,4637394881411,
 20257808425487,88856696223318,390704372696703,
 1722913681845064,7622404131695837]