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A215253 as a simple table

na(n)
11
22
34
49
518
637
777
8150
9333
10601
111202
122405
134941
149622
1521325
1638489
1776978
18153957

[1,2,4,9,18,37,77,150,333,601,1202,2405,4941,9622,
 21325,38489,76978,153957]