1,3
Cf. A088310.
Sequence in context: A002198 A163576 A145408 this_sequence A158042 A147860 A159409
Adjacent sequences: A088613 A088614 A088615 this_sequence A088617 A088618 A088619
nonn
Yuval Dekel and Vladeta Jovovic, Nov 17 2003
What if you also ask that the two main diagonals are also distinct? - N. J. A. Sloane (njas(AT)research.att.com), Jan 03 2004.
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