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A279554 as a simple table

na(n)
01
11
22
35
415
551
6188
7733
82979
912495
1053708
11235396
121048168
134728757
1421569339
1599309057
16460932778
172154402107

[1,1,2,5,15,51,188,733,2979,12495,53708,235396,
 1048168,4728757,21569339,99309057,460932778,
 2154402107]