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A071383 as a simple table

na(n)
10
21
35
425
565
6325
71105
84225
95525
1027625
1171825
12138125
13160225
14801125
152082925
164005625
175928325
1829641625
1977068225
20148208125
21243061325
221215306625
233159797225
246076533125
2512882250225
2653716552825
2764411251125

[0,1,5,25,65,325,1105,4225,5525,27625,71825,
 138125,160225,801125,2082925,4005625,5928325,
 29641625,77068225,148208125,243061325,1215306625,
 3159797225,6076533125,12882250225,53716552825,
 64411251125]