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Number of n X n symmetric 0..2 arrays with rows, considered as 3-ary numbers, in strictly increasing order
1

%I #5 Dec 18 2015 18:17:23

%S 3,12,124,3084,185372,27575084,10417956924,10221185826892,

%T 26504730763164764,184169429458588129644,3466700754295862842687612,

%U 178350026183671506033012278924,25264252738038225534160060999871644

%N Number of n X n symmetric 0..2 arrays with rows, considered as 3-ary numbers, in strictly increasing order

%H R. H. Hardin, <a href="/A162127/b162127.txt">Table of n, a(n) for n=1..15</a>

%K nonn

%O 1,1

%A _R. H. Hardin_ Jun 25 2009