OFFSET
1,2
COMMENTS
It seems that a(n) = O(n^2.9). - Andrey Zabolotskiy, Nov 09 2016
LINKS
Andrey Zabolotskiy, Table of n, a(n) for n = 1..260
EXAMPLE
a(4) = 7 and not 5 as 9 has already occurred in the previous row.
CROSSREFS
KEYWORD
nonn
AUTHOR
Amarnath Murthy, Oct 01 2002
EXTENSIONS
More terms from David Wasserman, Jan 22 2005
New name from Ivan Neretin, Nov 09 2016
STATUS
approved