login

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”).

A003109 as a simple table

na(n)
11
21
317
4117
51413
646389
71211085
847977305
92302999889
10137682614769
119844042388505
12832087399629125

[1,1,17,117,1413,46389,1211085,47977305,
 2302999889,137682614769,9844042388505,
 832087399629125]