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Number of nX3 0..2 arrays with all rows and columns having a nonnegative second derivative in a quadratic least squares fit, with one and two element arrays taken as having a zero second derivative
0

%I #3 Mar 18 2013 05:42:48

%S 16,256,1138,20016,252544,3407893,52906752,807057750,12038960562,

%T 208858564343,3119961979390

%N Number of nX3 0..2 arrays with all rows and columns having a nonnegative second derivative in a quadratic least squares fit, with one and two element arrays taken as having a zero second derivative

%C Column 3 of A223195

%e Some solutions for n=3

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 18 2013