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A279558 as a simple table

na(n)
01
11
22
35
415
552
6200
7830
83654
916869
1080963
11401300
122043610
1310649335
1456604706
15306101789
161680515427

[1,1,2,5,15,52,200,830,3654,16869,80963,401300,
 2043610,10649335,56604706,306101789,1680515427]