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A284070 as a simple table

na(n)
10
21
315
4314
53764
637557
7353608
83178404
927582216
10233397609
111936592863
1215815427428
13127479709618
141016314018380
158026733559938
1662881710177968
17489133088311108
183781016346686269
1929064881546033136
20222309716942266766

[0,1,15,314,3764,37557,353608,3178404,27582216,
 233397609,1936592863,15815427428,127479709618,
 1016314018380,8026733559938,62881710177968,
 489133088311108,3781016346686269,
 29064881546033136,222309716942266766]