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A226891 as a simple table

na(n)
21
32
44
519
663
7153
81273
92090
1019227
11266133
12868868
1310631543
14264365332
15662822809
16129102309125

[1,2,4,19,63,153,1273,2090,19227,266133,868868,
 10631543,264365332,662822809,129102309125]