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Number of nX7 0..2 arrays with rows and columns lexicographically nondecreasing read forwards and nonincreasing read backwards
1

%I #5 Mar 31 2012 12:36:45

%S 3,60,3838,607919,142436489,27102769900,3262897246338,253484699853930,

%T 13657827589827288,542530203631847499,16634470482072064655,

%U 407700696414920035296,8211702473582080609860,139013768818199221546289

%N Number of nX7 0..2 arrays with rows and columns lexicographically nondecreasing read forwards and nonincreasing read backwards

%C Column 7 of A201700

%H R. H. Hardin, <a href="/A201699/b201699.txt">Table of n, a(n) for n = 1..22</a>

%e Some solutions for n=3

%e ..0..1..1..1..1..2..2....0..0..0..0..0..2..2....0..1..1..1..1..1..1

%e ..2..0..0..1..2..0..0....0..2..2..2..2..0..0....1..0..0..0..1..1..1

%e ..2..2..2..1..0..0..0....2..1..1..1..1..0..0....2..1..1..1..0..0..0

%K nonn

%O 1,1

%A _R. H. Hardin_ Dec 03 2011