A223177 Number of (n+2)X5 0..1 arrays with all rows and columns having a strictly positive second derivative in a quadratic least squares fit

0, 40, 2076, 48316, 620568, 14777316, 246091276, 3081824360, 43744483080, 658808677292, 8732713535100, 101911005390840, 1638761493877308, 20319539313941196, 274686278842189276

Offset

1,2

Links

Table of n, a(n) for n=1..15.

Example

Some solutions for n=2
..1..1..0..1..1....1..1..0..1..1....1..1..0..1..1....1..0..1..1..1
..1..0..0..1..0....0..0..0..0..1....1..0..0..0..0....0..0..0..1..1
..0..0..0..0..1....1..0..0..0..0....0..0..0..0..1....1..0..0..0..0
..1..0..1..1..1....1..0..1..0..1....1..1..1..0..1....1..1..0..1..1

Crossrefs

Column 3 of A223179.

Sequence in context: A189550 A300116 A060056 * A140729 A003741 A263553

Adjacent sequences: A223174 A223175 A223176 * A223178 A223179 A223180

Keyword

nonn,more

Author

R. H. Hardin, Mar 17 2013

Status

approved