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”).

A016172 as a simple table

na(n)
01
115
2171
31755
417091
5161595
61501011
713789035
8125780931
91142106075
1010339420851
1193417584715
12842935044771
137599476096955
1468473649036691
15616733026314795
165553418346740611
1749997691780110235

[1,15,171,1755,17091,161595,1501011,13789035,
 125780931,1142106075,10339420851,93417584715,
 842935044771,7599476096955,68473649036691,
 616733026314795,5553418346740611,
 49997691780110235]