From 2002 to 2014 this was given as the sequence of Brier numbers. These /are/ Brier numbers, but there are many smaller numbers - see A076335.
Table of n, a(n) for n=1..4.
Sequence in context: A292859 A105299 A094232 * A210704 A132185 A003942
Adjacent sequences: A234591 A234592 A234593 * A234595 A234596 A234597
N. J. A. Sloane, Jan 03 2014