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A026521 as a simple table

na(n)
11
21
34
46
519
633
798
8180
9526
10990
112887
125502
1316073
1430863
1590386
16174456
17512128
18992304
192918954
205673140
2116716998
2232571858
2396119927
24187675644
25554524660
261084649644
273208254571
286284986554
2918607536319
3036501029265

[1,1,4,6,19,33,98,180,526,990,2887,5502,16073,
 30863,90386,174456,512128,992304,2918954,5673140,
 16716998,32571858,96119927,187675644,554524660,
 1084649644,3208254571,6284986554,18607536319,
 36501029265]