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A275396 as a simple table

na(n)
15
254
384
4178
5394
61017
72645
86980
918464
1048959
11129079
12340418
13895555
142359728
156219251
1616402499
1743261910
18114071354
19300754298
20792805040
212090067487
225510137826
2314527552687
2438302379482
25100983905166
26266240696535

[5,54,84,178,394,1017,2645,6980,18464,48959,
 129079,340418,895555,2359728,6219251,16402499,
 43261910,114071354,300754298,792805040,2090067487,
 5510137826,14527552687,38302379482,100983905166,
 266240696535]