Thanks to everyone who made a donation during our annual appeal! To see the list of donors, or make a donation, see the OEIS Foundation home page.
David Wells, Penguin Dictionary of Curious and Interesting Numbers, Entry 55.
Table of n, a(n) for n=1..24.
Sequence in context: A270970 A188092 A188080 * A285035 A233564 A030326
Adjacent sequences: A048259 A048260 A048261 * A048263 A048264 A048265