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A215397 as a simple table

na(n)
11
21
31
43
56
626
784
8324
91170
104412
1116313
1261138
13227383
14849667
153168419
1611831104
1744144206
18164792736
19615027929
202295714687

[1,1,1,3,6,26,84,324,1170,4412,16313,61138,227383,
 849667,3168419,11831104,44144206,164792736,
 615027929,2295714687]