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A149968 as a simple table

na(n)
01
12
25
316
455
5188
6674
72471
89067
933926
10128156
11484224
121847218
137084777
1427186054
15104885416
16405958461
171572023508
186108058902
1923783305717
2092648913045
21361724652715
221414358846767
235532545855330
2421675406458263
2585011660185348
26333545750611017
271310157468147696
285150459680441075

[1,2,5,16,55,188,674,2471,9067,33926,128156,
 484224,1847218,7084777,27186054,104885416,
 405958461,1572023508,6108058902,23783305717,
 92648913045,361724652715,1414358846767,
 5532545855330,21675406458263,85011660185348,
 333545750611017,1310157468147696,5150459680441075]