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%I #7 Jul 28 2020 11:13:06
%S 0,348,48316,2485972,76317552,3171271500,115722707546,2886324889628,
%T 88035882884812
%N Number of (n+2)X6 0..1 arrays with all rows and columns having a strictly positive second derivative in a quadratic least squares fit
%e Some solutions for n=2
%e ..1..1..1..0..1..1....1..0..1..1..1..1....1..1..0..1..1..1....1..1..1..0..1..1
%e ..0..1..0..0..0..1....1..0..0..0..0..0....1..0..0..0..0..0....1..0..0..0..1..0
%e ..1..0..0..0..1..0....0..0..1..0..0..1....0..0..0..0..0..1....0..1..0..0..0..1
%e ..1..1..0..1..1..1....1..1..1..1..0..1....1..1..1..0..1..1....1..1..0..1..1..1
%Y Column 4 of A223179.
%K nonn,more
%O 1,2
%A _R. H. Hardin_, Mar 17 2013