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A223178
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
0
0, 348, 48316, 2485972, 76317552, 3171271500, 115722707546, 2886324889628, 88035882884812
OFFSET
1,2
EXAMPLE
Some solutions for n=2
..1..1..1..0..1..1....1..0..1..1..1..1....1..1..0..1..1..1....1..1..1..0..1..1
..0..1..0..0..0..1....1..0..0..0..0..0....1..0..0..0..0..0....1..0..0..0..1..0
..1..0..0..0..1..0....0..0..1..0..0..1....0..0..0..0..0..1....0..1..0..0..0..1
..1..1..0..1..1..1....1..1..1..1..0..1....1..1..1..0..1..1....1..1..0..1..1..1
CROSSREFS
Column 4 of A223179.
Sequence in context: A054467 A230705 A230616 * A264326 A230609 A177174
KEYWORD
nonn,more
AUTHOR
R. H. Hardin, Mar 17 2013
STATUS
approved