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A045739 as a simple table

na(n)
21
39
470
5535
64101
731633
8245512
91915875
1015020545
11118231212
12933812892
137397179309
1458746824150
15467602683135
163729318261224
1729795160492299
18238421091129957
191910544426355420
2015329353155160880
21123138401704273620

[1,9,70,535,4101,31633,245512,1915875,15020545,
 118231212,933812892,7397179309,58746824150,
 467602683135,3729318261224,29795160492299,
 238421091129957,1910544426355420,
 15329353155160880,123138401704273620]