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”).

A146642 as a simple table

na(n)
11
21
31
417
553
6329
73935
873477
92119711
1076531381
114373283473
12404095793939
1355306039341887

[1,1,1,17,53,329,3935,73477,2119711,76531381,
 4373283473,404095793939,55306039341887]