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A180250 as a simple table

na(n)
10
21
35
435
5225
61475
79625
862875
9410625
102681875
1117515625
12114396875
13747140625
144879671875
1531869765625
16208145546875
171359425390625
188878582421875
1957987166015625
20378721654296875
212473479931640625
2216154616201171875
23105507880322265625

[0,1,5,35,225,1475,9625,62875,410625,2681875,
 17515625,114396875,747140625,4879671875,
 31869765625,208145546875,1359425390625,
 8878582421875,57987166015625,378721654296875,
 2473479931640625,16154616201171875,
 105507880322265625]