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%I #3 Mar 19 2013 17:52:21
%S 388,5450,120738,2326103,40102656,663777212,11304765020,167298254365,
%T 2855164209146
%N Number of (n+2)X3 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 Column 3 of A223391
%e Some solutions for n=1
%e ..2..0..2....2..2..2....2..2..2....2..2..2....2..2..2....2..1..1....0..0..2
%e ..0..0..1....1..0..1....0..0..1....1..0..0....0..0..0....1..0..0....0..0..1
%e ..2..1..2....1..0..2....0..1..2....2..0..1....1..1..2....1..0..0....2..1..1
%K nonn
%O 1,1
%A _R. H. Hardin_ Mar 19 2013