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A223393 Number of 4Xn 0..2 arrays with all rows having a nonnegative second derivative, and all columns having a positive second derivative in a quadratic least squares fit, with one and two element arrays taken as having a zero second derivative 0

%I

%S 31,961,5450,188958,4182458,101698908,2972878486,84155649292,

%T 2392654352060,83053389564196

%N Number of 4Xn 0..2 arrays with all rows having a nonnegative second derivative, and all columns having a positive second derivative in a quadratic least squares fit, with one and two element arrays taken as having a zero second derivative

%C Row 2 of A223391

%e Some solutions for n=3

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

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

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

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

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 19 2013

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Last modified June 24 21:51 EDT 2022. Contains 354830 sequences. (Running on oeis4.)