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”).

A220167 as a simple table

na(n)
13
26
322
476
5247
6848
72892
89969
934455
10119894
11420582
121482874
135254954
1418714432
1566969859
16240739417

[3,6,22,76,247,848,2892,9969,34455,119894,420582,
 1482874,5254954,18714432,66969859,240739417]