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”).

A053918 as a simple table

na(n)
15
215
3235
4485
51885
65765
715885
850235
957665
1072335
111798765
1215249765
13187703365
14179876492415
15159789024443333515
16576387476638096486959455635

[5,15,235,485,1885,5765,15885,50235,57665,72335,
 1798765,15249765,187703365,179876492415,
 159789024443333515,576387476638096486959455635]