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Number of n X n symmetric 0..4 arrays with rows, considered as 5-ary numbers, in strictly increasing order
1

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

%S 5,60,2760,484080,338068896,978499965120,12089923625362560,

%T 651463262292403173120,155573689115651381334403584,

%U 166729737526490189184729707572224

%N Number of n X n symmetric 0..4 arrays with rows, considered as 5-ary numbers, in strictly increasing order

%H R. H. Hardin, <a href="/A162129/b162129.txt">Table of n, a(n) for n=1..12</a>

%K nonn

%O 1,1

%A _R. H. Hardin_ Jun 25 2009