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A081567 as a simple table

na(n)
01
13
210
335
4125
5450
61625
75875
821250
976875
10278125
111006250
123640625
1313171875
1447656250
15172421875
16623828125
172257031250
188166015625
1929544921875
20106894531250
21386748046875
221399267578125
235062597656250
2418316650390625
2566270263671875
26239768066406250

[1,3,10,35,125,450,1625,5875,21250,76875,278125,
 1006250,3640625,13171875,47656250,172421875,
 623828125,2257031250,8166015625,29544921875,
 106894531250,386748046875,1399267578125,
 5062597656250,18316650390625,66270263671875,
 239768066406250]