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%I #3 Mar 19 2013 17:53:28
%S 11,121,388,4794,40416,375698,4128762,41424210,415135608,4912230456,
%T 49929186692,536801738054,5986390459865,67884672672695
%N Number of 3Xn 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 1 of A223391
%e Some solutions for n=3
%e ..1..0..2....2..1..1....2..0..1....2..0..2....2..1..2....1..0..2....1..1..2
%e ..0..0..1....0..0..1....0..0..1....0..0..1....0..0..1....0..0..0....1..0..1
%e ..2..1..2....2..1..2....0..1..2....0..1..2....0..0..1....2..1..2....2..0..2
%K nonn
%O 1,1
%A _R. H. Hardin_ Mar 19 2013
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