1,2

It seems that a(n) = O(n^2.9). - Andrey Zabolotskiy, Nov 09 2016

Andrey Zabolotskiy, Table of n, a(n) for n = 1..260

a(4) = 7 and not 5 as 9 has already occurred in the previous row.

Cf. A075649, A075650, A075651, A075652.

Sequence in context: A199971 A033082 A084406 * A071527 A307328 A097095

Adjacent sequences: A075645 A075646 A075647 * A075649 A075650 A075651

nonn

Amarnath Murthy, Oct 01 2002

More terms from David Wasserman, Jan 22 2005

New name from Ivan Neretin, Nov 09 2016

approved