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A149875 as a simple table

na(n)
01
12
25
313
445
5150
6548
71895
87595
928565
10115446
11438694
121862878
137407410
1431401854
15125165643
16548208863
172251065516
189811745632
1940261665482
20179765822208
21753826837023
223345833966405
2314001164979883
2463337842696640
25269572598312974
261211822937294886
275143408328423039

[1,2,5,13,45,150,548,1895,7595,28565,115446,
 438694,1862878,7407410,31401854,125165643,
 548208863,2251065516,9811745632,40261665482,
 179765822208,753826837023,3345833966405,
 14001164979883,63337842696640,269572598312974,
 1211822937294886,5143408328423039]