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A145549 as a simple table

na(n)
11
21
32
44
59
620
748
8115
9286
10719
111842
124766
1312485
1432969
1587795
16235326
17634664
181720573
194686829
2012820504
2135204254
2297001655
23268120807
24743236814
252065709551
265755253457

[1,1,2,4,9,20,48,115,286,719,1842,4766,12485,
 32969,87795,235326,634664,1720573,4686829,
 12820504,35204254,97001655,268120807,743236814,
 2065709551,5755253457]