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A340395 as a simple table

na(n)
25
315
450
5150
6455
71365
84100
912300
1036905
11110715
12332150
13996450
142989355
158968065
1626904200
1780712600
18242137805
19726413415
202179240250
216537720750
2219613162255
2358839486765
24176518460300
25529555380900
261588666142705
274765998428115
2814297995284350

[5,15,50,150,455,1365,4100,12300,36905,110715,
 332150,996450,2989355,8968065,26904200,80712600,
 242137805,726413415,2179240250,6537720750,
 19613162255,58839486765,176518460300,529555380900,
 1588666142705,4765998428115,14297995284350]