OFFSET
1,2
COMMENTS
The first constraint means that writing the binary representation of each number vertically yields a symmetrical plot about the line y = x (see the binary plot).
The second constraint ensures that the sequence contains only distinct terms, and differs from A000079.
The keywords "nice" and "look" are based on the fact that the binary plot is very interesting. - N. J. A. Sloane, Aug 22 2014
LINKS
Paul Tek, Table of n, a(n) for n = 1..3313
Paul Tek, Binary plot of the first hundred terms
Paul Tek, Perl program for this sequence
Eric Weisstein's World of Mathematics, Binary Plot
PROG
(Perl) See Link section.
CROSSREFS
KEYWORD
AUTHOR
Paul Tek, Aug 05 2014
STATUS
approved