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Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A026628 as a simple table

na(n)
11
26
321
479
5296
61117
74237
816147
961782
10237208
11913466
123526826
1313647886
1452920075
15205566205
16799791235
173116196550
1812157265980
1947485135510
20185671296850
21726703966600
222846827216330
2311161555459090
2443794648931054

[1,6,21,79,296,1117,4237,16147,61782,237208,
 913466,3526826,13647886,52920075,205566205,
 799791235,3116196550,12157265980,47485135510,
 185671296850,726703966600,2846827216330,
 11161555459090,43794648931054]