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

%I #6 Dec 18 2015 18:18:33

%S 2,9,49,272,1509,8375,46586,259927,1454873,8167578,45975525,259412481,

%T 1466771294,8308711329,47142516717,267868554552,1524033271457,

%U 8681096155047,49500982033342,282533898125471,1614019099745197

%N Number of n X n 0..1 arrays with rows and antidiagonals unimodal and columns nondecreasing

%C Diagonal of A224146

%H R. H. Hardin, <a href="/A224140/b224140.txt">Table of n, a(n) for n = 1..22</a>

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 31 2013