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”).

A018773 as a simple table

na(n)
11
22
35
410
5101
6202
7505
81010

[1,2,5,10,101,202,505,1010]