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A297295 as a simple table

na(n)
11
21
33
410
549
6495
713504
8629563
940753529
104162842319
11790491998237
12268041967942170
13155466640607601204
14159960976273554094907
15300474954115694463716874
161003924486221768324971576564

[1,1,3,10,49,495,13504,629563,40753529,4162842319,
 790491998237,268041967942170,155466640607601204,
 159960976273554094907,300474954115694463716874,
 1003924486221768324971576564]