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%I #12 Jul 28 2020 11:13:01
%S 0,4,40,348,1200,16348,94364,524292,2621432,16536796,84487288,
%T 391704968,2328596100,11355881256,62051315756,313489275420,
%U 1569528616420,8055413661476
%N Number of (n+2)X4 0..1 arrays with all rows and columns having a strictly positive second derivative in a quadratic least squares fit
%e All solutions for n=2
%e ..1..0..1..1....1..1..0..1....1..1..0..1....1..0..1..1
%e ..1..0..0..0....1..0..0..0....0..0..0..1....0..0..0..1
%e ..0..0..0..1....0..0..0..1....1..0..0..0....1..0..0..0
%e ..1..1..0..1....1..0..1..1....1..0..1..1....1..1..0..1
%Y Column 2 of A223179.
%K nonn,more
%O 1,2
%A _R. H. Hardin_, Mar 17 2013
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