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”).

A215049 as a simple table

na(n)
12
22
340
4335
52498
620886
7174368
81507722
913300713

[2,2,40,335,2498,20886,174368,1507722,13300713]