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Number of n X n 0..2 arrays with rows unimodal and antidiagonals nondecreasing
1

%I #6 Dec 18 2015 18:18:34

%S 3,54,1838,77793,3607078,174854516,8684742989,437757725110,

%T 22283207886650,1142441203546438,58904154561219603,

%U 3051594326913582293,158760240705250821719,8291742411017787312243,434658935860309950718887

%N Number of n X n 0..2 arrays with rows unimodal and antidiagonals nondecreasing

%C Diagonal of A224374

%H R. H. Hardin, <a href="/A224368/b224368.txt">Table of n, a(n) for n = 1..24</a>

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Apr 05 2013