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A026697 as a simple table

na(n)
21
35
435
5137
6844
73237
819289
974075
10435901
111681705
129840202
1338142908
14222555244
15866299556
165047109045
1719716828587
18114778868635
19449771556357
202617170238263
2110282678191109
2259821340594252
23235568344161873

[1,5,35,137,844,3237,19289,74075,435901,1681705,
 9840202,38142908,222555244,866299556,5047109045,
 19716828587,114778868635,449771556357,
 2617170238263,10282678191109,59821340594252,
 235568344161873]