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A149943 as a simple table

na(n)
01
12
25
315
449
5172
6627
72374
89218
936536
10147576
11604114
122505636
1310503384
1444429132
15189530129
16814217984
173520596956
1815311050911
1966930619301
20293971727765
211296689732244
225742062449808
2325518877148421
24113785729926120
25508913759962817
262282592025746653
2710264924766267955

[1,2,5,15,49,172,627,2374,9218,36536,147576,
 604114,2505636,10503384,44429132,189530129,
 814217984,3520596956,15311050911,66930619301,
 293971727765,1296689732244,5742062449808,
 25518877148421,113785729926120,508913759962817,
 2282592025746653,10264924766267955]