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”).

A273747 as a simple table

na(n)
01
15
225
397
4405
51501
65605
722533
890197
9361361
101445569
115767901
1223042037
1392096381
14368249841
151472853613

[1,5,25,97,405,1501,5605,22533,90197,361361,
 1445569,5767901,23042037,92096381,368249841,
 1472853613]