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A005053 as a simple table

na(n)
01
13
215
375
4375
51875
69375
746875
8234375
91171875
105859375
1129296875
12146484375
13732421875
143662109375
1518310546875
1691552734375
17457763671875
182288818359375
1911444091796875
2057220458984375

[1,3,15,75,375,1875,9375,46875,234375,1171875,
 5859375,29296875,146484375,732421875,3662109375,
 18310546875,91552734375,457763671875,
 2288818359375,11444091796875,57220458984375]